The Collaborative International Dictionary of English v.0.48:

Lepidopter \Lep`i*dop"ter\ (l[e^]p`[i^]*d[o^]p"t[~e]r), n. [Cf.
   F. l['e]pidopt[`e]re.] (Zool.)
   One of the Lepidoptera.
   [1913 Webster]