Definition of purple hairstreak
: a hairstreak butterfly that has the wings marked with iridescent purple: such as
a
: a European forest hairstreak (Thecla quercus)
b
: a large American hairstreak (Atlides halesus) with metallic spots on the largely bluish purple to greenish wings
— called also giant purple hairstreak
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Merriam-Webster unabridged
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