grinder - Wiktionary
One who grinds something, such as the teeth. scissors grinder (one who sharpens scissors) 2010, A. J. Larner, A Dictionary of Neurological Signs, page 68: Masseter hypertrophy may become apparent in persistent grinders.· (anatomy) A molar.· (slang) Any tooth. A power tool with a spinning abrasive disc, used for grinding, smoothing, and shaping ...