| 词源 |
molar n."grinding tooth, back-tooth," mid-14c., from Latin molaris dens "grinding tooth," from mola "millstone," from PIE root *mele- "to crush, grind." As an adjective, "grinding, crushing," as distinguished from "cutting" or "piercing," from 1620s. In Old English they were cweornteð "quern-teeth." molar adj. in chemistry, "pertaining to one mole of a substance," 1902, from mole (n.4) + -ar. Earlier it meant "pertaining to mass," from Latin moles "mass." updated on February 10, 2019 |