How a radical hints at meaning, and sometimes at sound
Roughly four out of five kanji are built from two parts: a semantic component that says what area of life the character belongs to, and a phonetic component that once told Chinese readers how to say it. The semantic part is usually the radical. The phonetic part is not always reliable in Japanese, because sounds shifted over the centuries, but it works far more often than beginners expect, and it works best for on readings.
Take 青, sei, meaning blue or green. Add the water radical and you get 清, clear or pure, read sei in seiketsu, clean. Add the sun radical and you get 晴, clear weather, read sei in seiten, fine weather. Add the rice radical and you get 精, refined or spirit, read sei in seishin, mind. Three characters, one sound, three meaning areas. Once you see this pattern you stop treating each kanji as a fresh drawing.
| Japanese | Romaji | Meaning |
|---|---|---|
| この漢字の部首は何ですか。 | Kono kanji no bushu wa nan desu ka. | What is the radical of this kanji? |
| さんずいがあるから、水に関係があると思います。 | Sanzui ga aru kara, mizu ni kankei ga aru to omoimasu. | It has the water radical, so I think it is related to water. |
| 右側の部分が音を表しています。 | Migigawa no bubun ga oto o arawashite imasu. | The right-hand part shows the sound. |
| 読み方は分かりませんが、意味は想像できます。 | Yomikata wa wakarimasen ga, imi wa sōzō dekimasu. | I do not know the reading, but I can guess the meaning. |
Water and fire: the two most productive groups
Water, 水, is the radical you will see most often. On the left of a character it shrinks to three dots, sanzui, and almost everything it touches is liquid, wet or flowing: 海 sea, 池 pond, 泳 swim, 洗 wash, 湯 hot water, 温 warm, 汗 sweat, 涙 tears, 決 decide.
Fire, 火, appears on the left as in 焼 grill and 煙 smoke, and along the bottom as four short strokes, rekka, in 熱 heat, 点 point and 無 nothing. The bottom form is the one people fail to recognise, so stare at 熱 until the four dots look like flames under a pot.
| Japanese | Romaji | Meaning |
|---|---|---|
| 夏は海で泳ぎます。 | Natsu wa umi de oyogimasu. | In summer I swim in the sea. |
| 熱があるので、今日は休みます。 | Netsu ga aru node, kyō wa yasumimasu. | I have a fever, so I will take today off. |
| この店は禁煙です。 | Kono mise wa kin'en desu. | This shop is non-smoking. |
| Kanji | Reading | Meaning |
|---|---|---|
| 海 | kai, umi | sea; umi, kaigan (coast) |
| 池 | chi, ike | pond; ike, denchi (battery) |
| 泳 | ei, oyo(gu) | swim; oyogu, suiei (swimming) |
| 洗 | sen, ara(u) | wash; arau, sentaku (laundry) |
| 湯 | tō, yu | hot water; o-yu, sentō (public bath) |
| 温 | on, atata(kai) | warm; atatakai, ondo (temperature) |
| 決 | ketsu, ki(meru) | decide; kimeru, kettei (decision) |
| 焼 | shō, ya(ku) | grill, burn; yaku, yakitori |
| 煙 | en, kemuri | smoke; kemuri, kin'en (no smoking) |
| 熱 | netsu, atsu(i) | heat; netsu, atsui (hot to touch) |
| 点 | ten | point, mark; ten, tenken (inspection) |
| 無 | mu, na(i) | nothing; muryō (free of charge) |
Notice the sound clue in 泳 and 永: both contain 永 and both are read ei. The same goes for 洗 and 先, both sen. The radical tells you which world you are in, the other half tells you how it sounds.
Tree and person: living things on the left
Tree, 木, keeps almost its full shape when it moves to the left, and it marks wood, plants and things made of wood: 林 woods, 森 forest, 校 school, 机 desk, 橋 bridge, 板 board, 桜 cherry tree, 村 village. Schools were wooden buildings, desks and bridges are wooden objects, and a village is a cluster of trees and houses.
Person, 人, becomes the two-stroke ninben on the left, and it points to people and what people do: 休 rest, a person leaning on a tree; 体 body; 住 live somewhere; 働 work; 使 use; 作 make; 信 believe, a person standing by their word; 何 what.
| Japanese | Romaji | Meaning |
|---|---|---|
| 森の中を散歩しました。 | Mori no naka o sanpo shimashita. | I took a walk in the forest. |
| この橋は木でできています。 | Kono hashi wa ki de dekite imasu. | This bridge is made of wood. |
| 駅の近くに住んでいます。 | Eki no chikaku ni sunde imasu. | I live near the station. |
| このペンを使ってもいいですか。 | Kono pen o tsukatte mo ii desu ka. | May I use this pen? |
Hand and heart: actions and feelings
Hand, 手, on the left becomes tehen, three strokes with a small hook, and it marks things you do with your hands: 持 hold, 打 hit, 投 throw, 押 push, 拾 pick up, 指 finger or point, 払 pay, 探 search, 描 draw. When you see tehen on a verb, you can guess it is a physical action before you know which one.
Heart, 心, does the same for feelings. Standing alone it appears at the bottom of 思 think, 急 hurry, 悪 bad, 意 intention and 忘 forget. Squeezed to the left it becomes risshinben, the vertical form in 情 feeling, 快 pleasant, 怖 scary, 悩 worry and 慣 get used to. Either way the message is the same: this character is about the inside of a person. A sister post on kanji for emotions and feelings covers that group in full.
| Kanji | Reading | Meaning |
|---|---|---|
| 持 | ji, mo(tsu) | hold; motsu, mochimono (belongings) |
| 押 | ō, o(su) | push; osu, the sign on a door |
| 拾 | shū, hiro(u) | pick up; hirou |
| 指 | shi, yubi, sa(su) | finger, point; yubi, sasu |
| 払 | futsu, hara(u) | pay; harau, shiharai (payment) |
| 探 | tan, saga(su) | search; sagasu |
| 思 | shi, omo(u) | think; omou, fushigi (mysterious) |
| 急 | kyū, iso(gu) | hurry; isogu, kyūkō (express train) |
| 忘 | bō, wasu(reru) | forget; wasureru, wasuremono |
| 情 | jō, nasa(ke) | feeling; jōhō (information), kanjō |
| 慣 | kan, na(reru) | get used to; nareru, shūkan (habit) |
Sound clues again: 持 and 時 share 寺 and both are read ji; 情, 清 and 晴 share 青 and are read sei or jō depending on the word.
Speech, road and roof: words, movement and shelter
Speech, 言, sits on the left of anything to do with language: 話 talk, 語 language, 読 read, 記 record, 計 measure or plan, 試 test, 説 explain, 談 discuss, 認 recognise, 誤 mistake. Kaiwa, conversation, is 会話; nihongo is 日本語; dokusho, reading, is 読書.
Road, 辶, called shinnyō, wraps around the bottom left of a character and marks movement and paths: 道 road, 近 near, 遠 far, 送 send, 通 pass through, 運 carry or luck, 進 advance, 返 return, 速 fast, 週 week. Once you notice the sweeping bottom stroke you will see it on every street sign.
Roof, 宀, ukanmuri, sits on top and points to houses and what happens inside them: 家 house, 安 cheap or safe, 室 room, 客 guest, 宿 lodge, 寝 sleep, 実 fruit or reality, 完 complete, 定 fixed.
| Japanese | Romaji | Meaning |
|---|---|---|
| 日本語で話してもいいですか。 | Nihongo de hanashite mo ii desu ka. | Is it all right if I speak in Japanese? |
| この道をまっすぐ行くと駅です。 | Kono michi o massugu iku to eki desu. | Go straight along this road and you reach the station. |
| 荷物を家に送りました。 | Nimotsu o ie ni okurimashita. | I sent the luggage to my house. |
| 今週は毎日通っています。 | Konshū wa mainichi kayotte imasu. | This week I am going every day. |
| 安いホテルを探しています。 | Yasui hoteru o sagashite imasu. | I am looking for a cheap hotel. |
| 客室は三階です。 | Kyakushitsu wa sangai desu. | The guest rooms are on the third floor. |
Where you meet these radicals in daily life
The fastest way to make radicals stick is to notice them outside the textbook. Here is where each group turns up most often in the first months in Japan or in Japanese media.
- Water and fire: bath signs (湯, 温泉), menus (焼肉, 焼き鳥), clinic forms (熱)
- Tree and person: surnames (森, 木村, 松本), notices (使用, 休業, 住所)
- Hand and heart: doors and tills (押, 支払い), adverts (愛, 感), health forms (不安)
- Speech, road and roof: language schools (話, 語), street signs (道, 通り), estate agents (家, 室)
Photograph a sign, cover the reading and ask yourself which radical group each kanji belongs to.
Look-alike radicals that cause mistakes
Several radicals differ by a single stroke, and misreading the radical sends your meaning guess the wrong way. These are the pairs worth checking every time.
| Japanese | Romaji | Meaning |
|---|---|---|
| 氷と水は一画違います。 | Kōri to mizu wa ikkaku chigaimasu. | Ice and water differ by one stroke. |
| 左側をよく見てください。 | Hidarigawa o yoku mite kudasai. | Look carefully at the left-hand side. |
| 点が一つ多いです。 | Ten ga hitotsu ōi desu. | There is one dot too many. |
- Sanzui 氵 (water) and nisui 冫 (ice): 泳 swim has three dots, 冷 cold and 凍 freeze have two
- Ninben 亻 (person) and gyōninben 彳 (going): 休 rest versus 待 wait, 行 go
- Tehen 扌 (hand) and kihen 木 (tree): 持 hold versus 村 village; hand has a hook, tree has a full cross
- Rekka 灬 (fire) and the four dots of 魚 (fish) and 馬 (horse): only 熱, 点, 無 and friends mean heat
- Risshinben 忄 (heart, left) and the small 小: 情 feeling versus 少 few; look for the two side dots
A four-week study plan for nine radicals
Learning radicals by group is more efficient than learning kanji in textbook order, because each new character reuses a shape you already own. This plan assumes fifteen minutes a day and covers the nine groups with around sixty kanji.
- Week 1: water and fire. Write each radical in its full and squeezed forms, then learn the twelve kanji in the water and fire table with one word each
- Week 2: tree, person and hand. Sort every kanji you already know into these three piles; anything left over goes into a fourth pile for later
- Week 3: heart, speech and road. Focus on the sound components: list every character with 青, 寺 and 反 you can find
- Week 4: roof, plus revision. Walk through a station or shopping street and name the radical of every kanji you see on signs
- Every day: ten minutes in Unihongo's free learning games on the week's kanji, then one short conversation using those words
At the end of the month, test yourself with a page of kanji you have never studied. You will not know their readings, but you should be able to say what most of them are about, and that is the moment radicals start paying you back.