grindstonen. 磨石、砂輪、石磨學術名詞磨石：電機工程、電力工程、機械工程、礦物學砂輪：電機工程、電力工程砥石：地質學研磨石：地質學英文釋義a revolving stone shaped like a disk; used to grind or sharpen or polish edge tools