any small, dark butterfly of the family Lycaenidae, having hairlike tails on the hind wings.

1810–20; hair + streak Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
hairstreak (ˈhɛəˌstriːk)
any small butterfly of the genus Callophrys and related genera, having fringed wings marked with narrow white streaks: family Lycaenidae

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
The globally uncommon early hairstreak butterfly uses beech as its larval host plant.
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