Source : Webster's Revised Unabridged Dictionary (1913)

Inequilateral \In*e`qui*lat"er*al\, a.
   1. Having unequal sides; unsymmetrical; unequal-sided.

   2. (Zo["o]l.) Having the two ends unequal, as in the clam,
      quahaug, and most lamellibranch shells.