Hairstreak meaning

hârstrēk
Any of numerous butterflies of the subfamily Theclinae, having transverse streaks on the undersurface of the wings and fine, hairlike projections on the hind wings.
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Any of a number of small, usually dark-colored butterflies (family Lycaenidae) with each hind wing commonly having narrow taillike projections.
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Any of many butterflies, of the subfamily Theclinae, that have hairlike projections on the back wings.
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Origin of hairstreak