| Readings | On-reading | けん |
| Kun-reading | とぐ | |
| Meaning | study of / to polish | |
| Radical |
石
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| Stroke count | ９ | |
| JLPT Level | N4 | |
Stroke order of 「研」
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Vocabulary contains 「研」
| Word | Meaning |
| 研究（けんきゅう） | research |
| 研修（けんしゅう） | training |
| 研ぐ（とぐ） | to polish / to sharpen |
