lepidopterist

from WordNet (r) 3.0 (2006)

lepidopterist
    n 1: an entomologist who specializes in the collection and study
         of butterflies and moths [syn: {lepidopterist},
         {lepidopterologist}, {butterfly collector}]

from The Collaborative International Dictionary of English v.0.48

Lepidopterist \Lep`i*dop"ter*ist\, n. (Zool.)
   One who studies the Lepidoptera.
   [1913 Webster]

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