The Collaborative International Dictionary of English v.0.48:

Lamellicorn \La*mel"li*corn\, a. [Lamella + L. cornu a horn: cf.
   F. lamellicorne. See Lamella.] (Zool.)
   (a) Having antennae terminating in a group of flat lamellae;
       -- said of certain coleopterous insects.
   (b) Terminating in a group of flat lamellae; -- said of
       antennae. -- n. A lamellicorn insect.
       [1913 Webster]