Etymology
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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."

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Definitions of molar
1
molar (adj.)
pertaining to large units of behavior; "such molar problems of personality as the ego functions"--R.R. Hunt;
molar (adj.)
of or pertaining to the grinding teeth in the back of a mammal's mouth;
molar teeth
molar (adj.)
designating a solution containing one mole of solute per liter of solution;
molar (adj.)
containing one mole of a substance;
molar weight
2
molar (n.)
grinding tooth with a broad crown; located behind the premolars;
Synonyms: grinder
From wordnet.princeton.edu