丸まる砥と石いしMeaningsNoun1. grindstoneKanji used丸circle砥whetstone石stoneComposed of丸まるcircle; entirety; whole; full; complete; enclosure inside a castle's walls; soft-shelled turtle; suffix for ship names; suffix for names of people (esp. infants); suffix for names of swords, armour, musical instruments, etc.; …Noun砥と石いしwhetstone; grindstoneNoun