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hairstreak

[hair-streek]
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noun
  1. any small, dark butterfly of the family Lycaenidae, having hairlike tails on the hind wings.
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Origin of hairstreak

First recorded in 1810–20; hair + streak
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for hairstreak

hairstreak

noun
  1. any small butterfly of the genus Callophrys and related genera, having fringed wings marked with narrow white streaks: family Lycaenidae
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012