"grinding tooth," mid-14c., from Latin molaris dens "grinding tooth," from mola "millstone," from PIE root *mele- "to crush, grind." As an adjective in this sense from 1620s. In Old English they were cweornteð "quern-teeth."
in chemistry, "pertaining to one mole," 1902, from mole (n.4) + -ar.
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