corneule

from The Collaborative International Dictionary of English v.0.48

Corneule \Cor"neule\ (k[^o]r"n[=u]l), n. [F., dim. of corn['e]e
   the cornea.] (Zool.)
   One of the corneas of a compound eye in the invertebrates.
   --Carpenter.
   [1913 Webster]