研

ケン

と.ぐ

研, 石, 口, 开, 干, 十

石

polish, study of, sharpen

研究(けんきゅう): study; research; investigation
研修(けんしゅう): training (esp. in-service); induction course
研究室(けんきゅうしつ): (1) laboratory (2) seminar room (3) professor's office
研ぐ(とぐ): (1) to sharpen; to hone; to whet; to grind (2) to wash (rice) (3) to scour; to polish; to burnish