hairstreak

[ hair-streek ]
/ ˈhɛərˌstrik /

noun

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

Origin of hairstreak

First recorded in 1810–20; hair + streak

British Dictionary definitions for hairstreak

hairstreak
/ (ˈhɛəˌstriːk) /

noun

any small butterfly of the genus Callophrys and related genera, having fringed wings marked with narrow white streaks: family Lycaenidae