The Collaborative International Dictionary of English v.0.48:

Lepadoid \Lep"a*doid\ (l[e^]p"[.a]*doid), n. [Lepas + -oid.]
   (Zool.)
   A stalked barnacle of the genus Lepas, or family
   Lepadid[ae]; a goose barnacle. Also used adjectively.
   [1913 Webster]