砥

whetstone, grindstone

Kun

と · といし · とぐ · みがくto · toishi · togu · migaku

On

シ · テイ · キイ · チshi · tei · kii · chi

Kun is the Japanese reading, used when the kanji stands alone with kana after it. On comes from Chinese and is mostly used in compound words.

Radical

石stone

Parts

石stone口mouth氏clan