Meaning
The kanji 芋 (imo) covers the whole family of tuber and corm vegetables — taro, sweet potatoes, yams, and common potatoes under one term. The character rarely stands alone to name a specific variety. In practice, it pairs with other kanji to form distinct words for each type. Spoken on its own, imo carries a rustic, autumnal feel: root vegetables dug from cold earth, simmered in outdoor pots, or roasted over charcoal on winter streets.
Structurally, 芋 is a phono-semantic compound. The top radical 艹 (grass/plants) marks it as a plant — the same element appears in kanji for vegetables, herbs, and grasses. The bottom component 于 works as a phonetic hint, giving the character its on'yomi reading of ウ (U). At just 6 strokes, 芋 is compact by Jōyō standards. It is a grade-8 kanji, formally taught in high school. Even so, it turns up constantly in everyday food vocabulary and idioms that any adult speaker recognizes.
Culturally, 芋 runs deep in Japanese food history. Taro (里芋) was one of the earliest cultivated plants in Japan, featuring prominently in regional autumn festivals — especially the imoni tradition of the Tōhoku region, where communities gather outdoors around enormous iron pots of taro stew. Sweet potatoes (薩摩芋) arrived via the Ryukyu Islands through Chinese and Portuguese trade routes and proved vital during Edo-period famines. The common potato (じゃが芋), whose name traces back to Jakarta (Jaga), became a pillar of home cooking — most famously as the anchor of nikujaga stew.
Readings
On'yomi (音読み) — Chinese-derived readings
The on'yomi of 芋 is ウ (U), inherited from Middle Chinese. In modern Japanese, this reading is nearly invisible — you won't encounter it on menus, in recipe books, or in everyday conversation. It survives mainly in classical literature and botanical texts. Still, it is worth knowing: the phonetic component 于 shares this U sound, which explains why the character is built the way it is.
Documented on'yomi usage:
- 芋 — (U) — found in classical and literary contexts referring to taro or root crops; not used in modern conversational Japanese
Kun'yomi (訓読み) — Native Japanese readings
The kun'yomi いも (imo) is the reading everyone uses. It predates Chinese script's arrival in Japan — a sign of how long root vegetables have been central to the Japanese table. You hear imo daily in kitchens, at markets, on izakaya menus, and in casual conversation. It also reaches well beyond food: several common idioms use imo to describe packed crowds, chain reactions, and country bumpkins.
- 芋 (imo) — generic term for potato, taro, or yam; the base word from which all compounds spring
- 里芋 (satoimo) — taro root; the "village potato," core ingredient of traditional simmered dishes
- 山芋 (yamaimo) — Japanese mountain yam; prized for its distinctive glutinous texture when grated
- 薩摩芋 (satsumaimo) — sweet potato; named after the Satsuma domain in southern Kyushu through which it entered Japan
- じゃが芋 (jagaimo) — the common potato (Solanum tuberosum); workhorse of Japanese home cooking
Common Words & Compounds
芋 turns up across a surprising range of Japanese vocabulary — from dish names on restaurant menus to idioms about corruption scandals. These compounds come up regularly in real conversation.
Culinary & Food Terms
- 里芋 (satoimo) — taro root; simmered in dashi broth, it becomes silky and mildly sweet; essential in oden and nimono
- 山芋 (yamaimo) — mountain yam; grated raw into tororo, a thick, sticky topping poured over hot rice or soba
- 薩摩芋 (satsumaimo) — sweet potato; roasted whole as yakiimo, mashed into kinton for New Year sweets, or used in tempura
- じゃが芋 (jagaimo) — common potato; the heart of nikujaga (meat and potato stew) and korokke (croquettes)
- 芋煮 (imoni) — taro stew cooked outdoors; a beloved autumnal communal tradition, particularly in Yamagata Prefecture
- 芋焼酎 (imojōchū) — sweet potato shochu; a distilled spirit from Kagoshima with a robust, earthy flavor
- 芋羊羹 (imoyōkan) — sweet potato yokan; a firm, sweet jelly-like wagashi confection popular as a tea accompaniment
Idiomatic & Figurative Expressions
- 芋虫 (imomushi) — caterpillar; named for its plump, segmented body that resembles a tuber in shape
- 芋づる (imoduru) — potato or taro vine; figuratively, a chain of connected things or people; pulling one leads to the rest
- 芋づる式 (imodurushiki) — chain-reaction style; one revelation or arrest leads to a cascade of further discoveries, like pulling a vine and uprooting all connected tubers
- 芋洗い (imoarai) — potato washing; metaphor for a place so densely packed with people that everyone is jostling together like potatoes tumbling in a wash bucket
- 芋侍 (imozamurai) — "potato samurai"; informal and somewhat derogatory slang for a country bumpkin or uncultured, rustic person
Example Sentences
芋が好きですか。
Imo ga suki desu ka.
Do you like potatoes (root vegetables)?
母は里芋の煮物を作ってくれた。
Haha wa satoimo no nimono wo tsukutte kureta.
My mother made me a simmered taro dish.
秋になると、焼き芋の屋台が街に並ぶ。
Aki ni naru to, yakiimo no yatai ga machi ni narabu.
When autumn comes, roasted sweet potato stalls line up throughout the streets.
山芋をすりおろしてご飯にかけると美味しい。
Yamaimo wo surioroshite gohan ni kakeru to oishii.
If you grate mountain yam and pour it over rice, it tastes delicious.
あの居酒屋では芋焼酎が一番人気だ。
Ano izakaya de wa imojōchū ga ichiban ninki da.
At that izakaya, sweet potato shochu is the most popular drink.
駅のホームは芋洗いのような混雑だった。
Eki no hōmu wa imoarai no yōna konzatsu datta.
The station platform was packed with people like potatoes being washed — an absolute crowd.
東北の芋煮会は毎年秋に行われる伝統的な行事だ。
Tōhoku no imonikai wa maitoshi aki ni okonawareru dentōteki na gyōji da.
The taro stew gathering in Tōhoku is a traditional event held every autumn.
その汚職事件は芋づる式に多くの政治家を巻き込んだ。
Sono oshoku jiken wa imodurushiki ni ōku no seijika wo makikonda.
That corruption scandal ensnared many politicians one after another in a chain reaction.
薩摩芋は食物繊維が豊富で、健康に良いとされている。
Satsumaimo wa shokumotsuseni ga hōfu de, kenkō ni yoi to sarete iru.
Sweet potatoes are rich in dietary fiber and are considered beneficial for health.
子供の頃、祖父の畑で芋を掘るのが楽しかった。
Kodomo no koro, sofu no hatake de imo wo horu no ga tanoshikatta.
When I was a child, digging up potatoes in my grandfather's field was so much fun.
Memory Tip
Split 芋 into its two halves. The top radical 艹 shows two shoots pushing up through soil toward sunlight — the visible, leafy tops of a taro or potato plant. Below, the component 于 represents the underground network: roots spreading outward, storing energy in swollen tubers. The whole character catches a root vegetable between sky and earth.
For the reading imo, picture a winter street vendor calling 「やきいも〜！」 as smoke drifts from a drum of roasting sweet potatoes — that image tends to stick. And once you know 芋づる式, the chain-reaction idiom, the rest of the imo vocabulary tends to follow like tubers on a vine.