# 核 — nucleus; core

核 means “nucleus; core”. It is a JLPT N1 kanji written with 10 strokes. On'yomi: カク (kaku). It has no common kun'yomi. You'll see it in words such as 核 (kaku, “nucleus; fruit stone”).

- Meaning: nucleus; core
- On'yomi: カク (kaku)
- Kun'yomi: —
- Strokes: 10
- Level: JLPT N1 · set Metal, stone & materials 1

## How to remember 核

Parts: 木 tree · 亥 boar sign

## Words with 核

| Word | Reading | Meaning |
| --- | --- | --- |
| 核 | かく (kaku) | nucleus; fruit stone |

## Don't confuse it with

[刻](https://moji.ninja/n2-kanji/engrave/) · [該](https://moji.ninja/n1-kanji/the-said/) · [劾](https://moji.ninja/n1-kanji/impeach/) · [刹](https://moji.ninja/n1-kanji/buddhist-temple/)

## More in the “Metal, stone & materials 1” set

[核](https://moji.ninja/n1-kanji/nucleus/) · [素](https://moji.ninja/n1-kanji/element/) · [鋼](https://moji.ninja/n1-kanji/steel/) · [粘](https://moji.ninja/n1-kanji/sticky/) · [晶](https://moji.ninja/n1-kanji/crystal/) · [磁](https://moji.ninja/n1-kanji/magnet/) · [鉛](https://moji.ninja/n1-kanji/lead-metal/)

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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/n1-kanji/nucleus/. Last updated 2026-11-01.