Source : Webster's Revised Unabridged Dictionary (1913)

Molar \Mo"lar\, a. [L. molaris, fr. mola mill, fr. molere to
   grind in a mill. See {Mill} the machine.]
   Having power to grind; grinding; as, the molar teeth; also,
   of or pertaining to the molar teeth. --Bacon.

Molar \Mo"lar\, n. (Anat.)
   Any one of the teeth back of the incisors and canines. The
   molar which replace the deciduous or milk teeth are
   designated as {premolars}, and those which are not preceded
   by deciduous teeth are sometimes called {true molars}. See
   {Tooth}.

Molar \Mo"lar\, a. [L. moles mass.] (Mech.)
   Of or pertaining to a mass of matter; -- said of the
   properties or motions of masses, as distinguished from those
   of molecules or atoms. --Carpenter.

Source : WordNet®

molar
     n : grinding tooth with a broad crown; located behind the
         premolars [syn: {grinder}]

molar
     adj 1: designating a solution containing 1 mole of solute per 1000
            grams of solvent [syn: {molal}]
     2: of or pertaining to molar teeth; "molar weight"
     3: containing one mole of a substance; "molar weight"
     4: pertaining to large units of behavior; "such molar problems
        of personality as the ego functions"--R.R. Hunt [syn: {molar(a)}]
        [ant: {molecular(a)}]