The Collaborative International Dictionary of English v.0.48:

Molar \Mo"lar\, n. (Anat.)
   Any one of the teeth back of the incisors and canines. The
   molars 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.
   [1913 Webster]