The Collaborative International Dictionary
Inequilateral
Inequilateral \In*e`qui*lat"er*al\, a.
Having unequal sides; unsymmetrical; unequal-sided.
(Zo["o]l.) Having the two ends unequal, as in the clam, quahaug, and most lamellibranch shells.
Wiktionary
inequilateral
a. Having unequal sides; unsymmetrical or lopsided