The Collaborative International Dictionary of English v.0.48:

Phalaena \Pha*l[ae]"na\ (f[.a]*l[=e]"n[.a]), prop. n. [NL., fr.
   Gr. fa`laina, fa`llaina, a kind of moth.] (Zool.)
   A linn[ae]an genus which included the moths in general.
   [1913 Webster]