molar (M) /mō″lər/ [L, moles, mass] , 1. any of the 12 teeth, six in each dental arch, located posterior to the premolars. The crown of each molar is nearly cubical, convex on its buccal and lingual surfaces, and flattened on its surfaces of contact. Each of the upper molars can have three roots. The roots of each third upper molar are often fused. The lower molars are larger than the upper, and each has two roots. The roots of each third lower molar tend to fuse. Molars are used to crush and grind food. 2. (M) pertaining to the concentration of a solution, expressed as the number of moles of solute per liter of solution. See also mole2.
