# 研 — Sharpen

Frequency rank 469 / 2,608 in published Japanese.

Frequent enough that you will keep running into it once you read past headlines.

More common than 黒 (Black), less common than 製 (Manufacture).

- On’yomi: けん
- Kun’yomi: と
- Radical: 石 Stone (Kangxi 112)
- Frequency path: Level IV of XX

A stone (stone) sits on the left and a lantern (lantern) glows on the right — rubbing the stone against the lantern sharpens it to a fine edge, sparks flying as metal meets stone.

In words:

- 研究 けんきゅう — research
- 研ぐ とぐ — to sharpen;to grind;to scour;to hone;to polish;to wash (rice)
- 研修 けんしゅう — training

[Study 研](https://app.kanjidrift.com/study?kanji=%E7%A0%94)

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