# 沸 — boil

沸 means “boil”. It is a JLPT N2 kanji written with 8 strokes. On'yomi: フツ (futsu). Kun'yomi: わ(く) (waku). You'll see it in words such as 沸かす (wakasu, “to boil; to heat”).

- Meaning: boil
- On'yomi: フツ (futsu)
- Kun'yomi: わ(く) (waku)
- Strokes: 8
- Level: JLPT N2 · set Water & the sea 2

## How to remember 沸

Parts: 氵 water · 弓 bow · 丿 slash · 丨 stick

## Words with 沸

| Word | Reading | Meaning |
| --- | --- | --- |
| 沸かす | わかす (wakasu) | to boil; to heat |
| 沸く | わく (waku) | to grow hot; to boil |

## Don't confuse it with

[弟](https://moji.ninja/n4-kanji/younger-brother/)

## More in the “Water & the sea 2” set

[溶](https://moji.ninja/n2-kanji/dissolve/) · [乾](https://moji.ninja/n2-kanji/dry/) · [湿](https://moji.ninja/n2-kanji/damp/) · [蒸](https://moji.ninja/n2-kanji/steam/) · [濯](https://moji.ninja/n2-kanji/rinse/) · [沸](https://moji.ninja/n2-kanji/boil/) · [燥](https://moji.ninja/n2-kanji/arid/) · [滴](https://moji.ninja/n2-kanji/drip/)

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From Moji Ninja (https://moji.ninja/), a free app for learning hiragana, katakana and the JLPT kanji from N5 to N1 with spaced repetition. Page: https://moji.ninja/n2-kanji/boil/. Last updated 2026-11-01.