Inequilateral
Pronunciation : In*e`qui*lat"er*al
Part of Speech : a.
Definition : 1. Having unequal sides; unsymmetrical; unequal-sided.
2. (Zo?l.)
Defn: Having the two ends unequal, as in the clam, quahaug, and most lamellibranch shells.
Source : Webster's Unabridged Dictionary, 1913