Japanese Whisky Glossary: Every Term You Need to Know

This glossary covers 60+ terms across production, cask types, labeling, serving styles, and Japanese cultural vocabulary related to whisky.
Each entry includes the Japanese characters and romaji pronunciation so you can read labels, menus, and distillery signs in Japan.
JSLMA labeling terms are critical for understanding what qualifies as Japanese Whisky under the 2021 standards.
Bookmark this page as a reference when reading tasting notes, shopping, or visiting distilleries.

Production Terms

Bakushu (麦酒, ばくしゅ)

Literally “barley alcohol.” In modern usage this word means beer, but it appears historically in whisky contexts when discussing malt fermentation.

Chitsu (チッツ) / Peat (ピート)

Peat, the decomposed plant material burned to dry malted barley, creating smoky flavors. Japanese distilleries source peat from Hokkaido (notably Akkeshi and Yoichi) or import Scottish peat. Peating levels are measured in PPM (phenol parts per million). Chichibu The Peated and Yoichi Single Malt are notable peated Japanese whiskies.

Coffey Still (コフィースチル, こふぃーすちる)

A type of continuous column still patented by Aeneas Coffey in 1830. Unlike pot stills which run in batches, Coffey stills distill continuously, producing lighter, higher ABV spirit. Nikka operates Coffey stills at Miyagikyo, producing Nikka Coffey Grain and Nikka Coffey Malt. The name has nothing to do with coffee.

Genshu (原酒, げんしゅ)

Undiluted or cask strength whisky. The spirit goes from cask to bottle without added water to reduce ABV. Genshu whiskies are typically 50% to 65% ABV. Nikka From The Barrel at 51.4% ABV is sometimes described as near genshu, though Nikka does blend to that specific ABV.

Hakkou (発酵, はっこう)

Fermentation. The process where yeast converts sugars in the wort into alcohol. Japanese distilleries use wooden (sugi cedar or mizunara) or stainless steel washbacks. Fermentation typically lasts 3 to 5 days.

Jouryuu (蒸留, じょうりゅう)

Distillation. The process of heating fermented liquid to separate alcohol from water. Japanese whisky uses both pot stills (tanshiki jouryuuki, 単式蒸留器) for malt whisky and continuous stills (renzoku jouryuuki, 連続蒸留器) for grain whisky.

Koji (麹, こうじ)

A mold (Aspergillus oryzae) used to convert starches into fermentable sugars. Essential in sake, shochu, and miso production. While not standard in whisky making (which uses malting instead), some experimental Japanese distillers have used koji in fermentation trials, blurring the line between whisky and shochu traditions.

Moromi (醪, もろみ)

The fermented mash before distillation. In whisky production, this is the liquid in the washback after yeast has converted sugars to alcohol. The term is shared with sake and shochu production.

Seibaku (製麦, せいばく) / Malting

The process of soaking barley in water, allowing it to germinate, then drying it to produce malted barley. Some Japanese distilleries do their own floor malting (notably Chichibu), while most import malt from Scotland or use commercial maltsters.

Tanshiki jouryuuki (単式蒸留器, たんしきじょうりゅうき)

Pot still. A batch distillation device used for malt whisky production. Japanese distilleries often have multiple pot stills of different shapes and sizes within a single distillery to create variety without trading casks with other producers. Yamazaki operates 12 pot stills (6 wash, 6 spirit) in various shapes.

Wort (麦汁, ばくじゅう / ウォート)

The sweet liquid produced after mashing malted barley with hot water. This sugar rich liquid is transferred to washbacks for fermentation. Japanese term: bakujuu.

Cask and Aging Terms

Hogshead (ホグスヘッド)

A cask size holding approximately 250 liters, commonly made by reassembling staves from smaller bourbon barrels with new ends. Widely used in Japanese whisky maturation.

Mizunara (ミズナラ / 水楢)

Japanese oak (Quercus crispula), native to Hokkaido and northern Honshu. Imparts distinctive sandalwood, incense, and coconut notes found in no other wood type. Trees take around 200 years to reach cask making size, and the wood is porous and prone to leaking, making Mizunara casks rare and expensive. Suntory has worked with Mizunara since World War II, when American and European oak imports were unavailable. Read more in our Mizunara oak guide.

Sherry Butt (シェリーバット)

A large cask (approximately 500 liters) previously used to age sherry wine. Imparts dried fruit, chocolate, and nutty flavors. Common in Japanese whisky maturation alongside bourbon barrels and Mizunara.

Sugi (杉, すぎ) / Japanese Cedar

A species of Japanese cedar sometimes used for washbacks (fermentation vessels) and occasionally for cask finishing. Sugi imparts subtle herbal and woody notes distinct from oak.

Taru (樽, たる)

The general Japanese word for barrel or cask. You will see this on labels, distillery tours, and whisky bars. “Taru zake” (樽酒) refers to sake aged in cedar casks, a different tradition.

Tenshi no Wakemae (天使の分け前, てんしのわけまえ)

Angel’s share. The portion of whisky lost to evaporation during cask aging. In Japan’s humid, hot summers, the angel’s share can be significantly higher (3% to 5% per year or more) than in Scotland (roughly 2%), which accelerates maturation but reduces yield.

Labeling and Classification Terms

Blended Whisky (ブレンデッドウイスキー)

A whisky made by combining malt whisky and grain whisky. Under JSLMA standards, both components must be produced in Japan. Hibiki Harmony is Suntory’s flagship blended whisky, combining malt from Yamazaki and Hakushu with grain from Chita.

Blended Malt (ブレンデッドモルト)

A whisky made by blending malt whiskies from two or more distilleries, without any grain whisky. Taketsuru Pure Malt is an example, blending malt from Yoichi and Miyagikyo. “Pure malt” (ピュアモルト) is an older term for the same category still used on some Japanese labels.

Cask Strength (カスクストレングス)

See Genshu. Whisky bottled at barrel proof without dilution. Also called barrel proof in American whisky terminology.

GI (Geographical Indication, 地理的表示)

A legal designation protecting regional products. Japan has explored GI protection for whisky, similar to how Scotch whisky is protected under EU and UK law. As of 2026, Japanese whisky does not have formal GI status, relying instead on the JSLMA voluntary standards.

Grain Whisky (グレーンウイスキー)

Whisky distilled from cereal grains (typically corn) using continuous stills, producing a lighter, milder spirit than malt whisky. Chita Single Grain and Nikka Coffey Grain are single grain whiskies from Japan. Grain whisky forms the base of most blended whiskies.

JSLMA (日本洋酒酒造組合, にほんようしゅしゅぞうくみあい)

Japan Spirits and Liqueurs Makers Association. The trade body that published voluntary labeling standards in February 2021 defining what can be called Japanese Whisky. Requirements include: raw ingredients must include malted grain, water extracted in Japan, saccharification/fermentation/distillation at a Japanese distillery, minimum 3 years aging in wooden casks in Japan, bottling in Japan, minimum 40% ABV. Full compliance enforced from April 2024 for members. Read more in our JSLMA standards guide.

NAS (No Age Statement, ノンエイジ)

A whisky that does not declare the age of its youngest component on the label. Many Japanese distilleries shifted to NAS releases after stock shortages caused by the 1990s and 2000s decline in domestic demand. NAS does not indicate low quality. Hakushu Distiller’s Reserve and Hibiki Harmony are respected NAS expressions. Read more in our NAS guide.

Nihon no Whisky (日本のウイスキー)

“Whisky of Japan” or “Whisky from Japan.” A broader, informal term for any whisky produced or bottled in Japan, regardless of whether it meets JSLMA standards. Bottles that use imported distillate or do not meet other JSLMA criteria cannot be labeled “Japanese Whisky” (ジャパニーズウイスキー) but may still be marketed as being from Japan.

Pure Malt (ピュアモルト)

An older labeling term equivalent to blended malt, meaning a blend of malt whiskies from multiple distilleries with no grain whisky. Still used on some Japanese labels, particularly Nikka’s Taketsuru range. The term is not defined in JSLMA standards, so its use is producer discretion.

Single Grain (シングルグレーン)

Grain whisky produced at a single distillery. Despite the name, “single” refers to the distillery, not the type of grain used.

Single Malt (シングルモルト)

Whisky made entirely from malted barley at a single distillery using pot stills. Yamazaki 12 is Japan’s most famous single malt. Under JSLMA standards, the distillery must be in Japan.

World Blend / World Whisky (ワールドブレンド)

A whisky that blends Japanese distillate with imported whisky from other countries. These cannot be labeled “Japanese Whisky” under JSLMA standards. Examples include Nikka From The Barrel (which contains Scottish malt from Ben Nevis) and Ichiro’s Malt and Grain (which blends Japanese and imported components).

Serving and Drinking Terms

Chaser (チェイサー)

A drink taken alongside whisky, typically still water. In Japanese bars, a chaser is almost always provided automatically when you order whisky neat.

Highball (ハイボール, はいぼーる)

Whisky mixed with carbonated water, typically at a 1:3 or 1:4 ratio. The highball is Japan’s most popular whisky serve, revived by Suntory in the late 2000s. Suntory Kakubin and Suntory Toki are popular highball whiskies. Read more in our highball guide.

Half Rock (ハーフロック, はーふろっく)

A Japanese serving style where whisky is poured over ice with an equal measure of water added. Combines the dilution of mizuwari with the chilling of on the rocks.

Kanpai (乾杯, かんぱい)

The Japanese toast, equivalent to “cheers.” Literally means “dry cup” (drink it all). Used before the first sip at any drinking occasion.

Mizuwari (水割り, みずわり)

Whisky mixed with still water, typically at a 1:2 or 1:2.5 ratio. One of the most common ways to drink whisky with food in Japan. The dilution softens the alcohol and opens up delicate flavors, making it an ideal pairing for lighter Japanese dishes like sushi and tempura.

On the Rocks (オンザロック, おんざろっく)

Whisky served over ice. In Japan, bartenders often use a single large hand carved ice sphere or cube to minimize dilution while chilling the spirit.

Oyuwari (お湯割り, おゆわり)

Whisky mixed with hot water, typically at a 1:2 or 1:3 ratio. A traditional Japanese winter serve that opens up aromas. Common in izakayas during cold months.

Straight / Neat (ストレート)

Whisky served at room temperature without ice or water. Japanese bars typically serve a small amount (30ml) with a chaser of water on the side.

Twice Up (トゥワイスアップ)

Whisky diluted with an equal amount of room temperature water, without ice. A tasting technique used by blenders and at distilleries to open up aromas while maintaining body.

Cultural and Venue Terms

Chuusen (抽選, ちゅうせん)

Lottery. The system used by Suntory, Nikka, and craft distilleries to allocate limited edition and allocated bottles in Japan. Buyers enter a lottery for the chance to purchase at retail price. Read more in our lottery guide.

Izakaya (居酒屋, いざかや)

A Japanese pub or gastropub serving drinks alongside small shared dishes. Izakayas are where most casual whisky drinking happens in Japan, typically as highballs paired with yakitori, edamame, and other snacks.

Menzei (免税, めんぜい)

Tax free or duty free. Look for “menzei” signs at shops in Japan. Tax free shopping for tourists requires spending ¥5,000 or more at a participating store with your passport. Note: Japan’s tax free system is transitioning to a refund at departure model from November 2026.

Nomikai (飲み会, のみかい)

A drinking party or social gathering, often work related. The context in which many Japanese people first encounter whisky highballs. “Nomi” means drink, “kai” means gathering.

Shochu (焼酎, しょうちゅう)

A Japanese distilled spirit made from barley, sweet potato, rice, or other ingredients. Not whisky, but relevant because many Japanese whisky distilleries have roots in shochu production (notably Kanosuke, Hombo Shuzo, and Eigashima Shuzo). Some shochu production techniques influence Japanese whisky making.

Snack Bar (スナック)

A type of small Japanese bar with a host or hostess, where drinks (often whisky) are served alongside conversation and light snacks. Not related to food “snacks” in the Western sense. Bottle keep (ボトルキープ) is common at snack bars.

Tachinomiya (立ち飲み屋, たちのみや)

A standing bar. Affordable, casual bars where customers drink while standing. Common in train station areas and shopping districts. A good place to find reasonably priced Japanese whisky pours in Japan.

Tokkuri (徳利, とっくり)

A ceramic serving vessel traditionally used for sake, occasionally seen in whisky serving contexts, particularly for oyuwari.

Distillery and Industry Terms

Bottle Keep (ボトルキープ)

A system at Japanese bars where customers buy a full bottle of whisky and the bar stores it for future visits, labeled with the customer’s name. Economical for regular drinkers and common at izakayas and snack bars.

Jizake (地酒, じざけ)

Literally “local alcohol,” typically referring to regional sake. The concept extends to local whisky as Japan’s craft distillery boom has produced regional expressions. Similar to the concept of terroir in wine.

Kura (蔵, くら)

A storehouse or brewery. While traditionally used for sake breweries, the term appears in some whisky contexts. The Kurayoshi brand name comes from this word, though that brand uses imported whisky and is not JSLMA compliant.

Meigara (銘柄, めいがら)

Brand name or label. Used when discussing different whisky brands and expressions. “Kono meigara wa?” means “What brand is this?”

Seizo (製造, せいぞう)

Manufacturing or production. Appears on labels and official documentation. “Seizousho” (製造所) means production facility or distillery.

Shuzou / Shuzo (酒造, しゅぞう)

Sake or spirit making. Appears in many company names: Nikka Whisky Distilling (ニッカウヰスキー), Hombo Shuzo (本坊酒造, Hombo Shuzo), Eigashima Shuzo (江井ヶ嶋酒造). Understanding this helps you navigate Japanese distillery names.

Tasting and Quality Terms

Aji (味, あじ)

Taste or flavor. A general term you will hear at tastings and on menus.

Kaori (香り, かおり)

Aroma or fragrance. Used when describing the nose of a whisky. “Yoi kaori” (良い香り) means “good aroma.”

Koku (コク)

Richness, depth, or body. A tasting term describing fullness and complexity. Used across Japanese food and drink culture, not just whisky.

Kuchiatari (口当たり, くちあたり)

Mouthfeel. How the whisky feels on the palate: smooth, oily, light, heavy.

Nomiyasui (飲みやすい, のみやすい)

Easy to drink. A common descriptor for lighter, approachable whiskies. Often used for Suntory Toki and other entry level expressions. Not a criticism in Japanese drinking culture, where smoothness and food compatibility are valued.

Umami (旨味, うまみ)

The fifth taste (alongside sweet, sour, salty, bitter). Describes a savory, brothy depth. Occasionally referenced in whisky tasting notes, particularly for whiskies with grain or koji influenced character.

FAQ

What does JSLMA mean in Japanese whisky?

JSLMA stands for Japan Spirits and Liqueurs Makers Association (日本洋酒酒造組合). It is the trade body that published voluntary labeling standards in February 2021 defining what can be called Japanese Whisky. Full compliance was enforced from April 2024 for members.

What is Mizunara oak?

Mizunara (ミズナラ, Quercus crispula) is a species of oak native to Japan. It imparts distinctive sandalwood, incense, and coconut notes to whisky. Mizunara trees take around 200 years to reach cask making size, making these casks rare and expensive.

What does NAS mean on a whisky bottle?

NAS stands for No Age Statement. It means the bottle does not declare the age of its youngest component. Many Japanese distilleries shifted to NAS releases after stock shortages from the 1990s and 2000s decline in domestic demand. NAS does not mean low quality.

What is the difference between single malt and blended Japanese whisky?

Single malt is made entirely from malted barley at one distillery using pot stills. Blended whisky combines malt whisky and grain whisky, potentially from multiple distilleries. Under JSLMA standards, both must be produced, aged, and bottled in Japan to carry the Japanese Whisky label.

What is mizuwari?

Mizuwari (水割り) is a Japanese serving style where whisky is mixed with still water, typically at a 1:2 or 1:2.5 ratio of whisky to water. It is a common way to drink whisky with meals in Japan, softening the alcohol and opening up delicate flavors.

What does genshu mean?

Genshu (原酒) means undiluted or cask strength. It indicates a whisky that has not been diluted with water after maturation, typically resulting in higher ABV (often 50% to 65%). It is similar to the Scotch term cask strength.