the branch of zoology dealing with butterflies and moths.
Also, lepidoptery [lep-i-dop-tuh-ree] .

1895–1900; Lepidopter(a) + -o- + -logy

lepidopterological [lep-i-dop-ter-uh-loj-i-kuhl] , adjective
lepidopterist, noun
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World English Dictionary
lepidopterist (ˌlɛpɪˈdɒptərɪst)
a person who studies or collects moths and butterflies

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1828, from Lepidoptera (Linnaeus, 1735), Mod.L. name for the insect order which comprises butterflies and moths, from Gk. lepido-, comb. form of lepis (gen. lepidos) "(fish) scale" (related to lepein "to peel") + pteron "wing, feather" (see petition).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
What is less well known is that he was also a lepidopterist who named dozens of new species and subspecies of butterflies.
Each lepidopterist has his or her own favorite recipe.
All records in the original files were checked by a qualified lepidopterist before inclusion.
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