a lepidopterous insect.

1850–55; Lepidopter(a) + -an

nonlepidopteran, adjective, noun
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World English Dictionary
lepidopteran (ˌlɛpɪˈdɒptərən)
n , pl -terans, -tera
1.  any of numerous insects of the order Lepidoptera, typically having two pairs of wings covered with fragile scales, mouthparts specialized as a suctorial proboscis, and caterpillars as larvae: comprises the butterflies and moths
2.  of, relating to, or belonging to the order Lepidoptera
[C19: from New Latin lepidoptera, from lepido- + Greek pteron wing]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
lepidopteran   (lěp'ĭ-dŏp'tər-ən)  Pronunciation Key 
Any of various insects of the order Lepidoptera, characterized by four large, flat, membranous wings covered with small scales. The larvae of lepidopterans are caterpillars. Lepidopterans include butterflies, moths, and skippers.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The lepidopteran group of insects includes butterflies and moths.
Laboratory rearing procedures for two lepidopteran weed biocontrol agents.
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