anisopleura

from The Collaborative International Dictionary of English v.0.48

Anisopleura \An`i*so*pleu"ra\, n. pl. [NL., fr. Gr. ? unequal +
   ? side.] (Zool.)
   A primary division of gastropods, including those having
   spiral shells. The two sides of the body are unequally
   developed.
   [1913 Webster]