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Definition of hairstreak
: any of a subfamily (Theclinae of the family Lycaenidae) of small butterflies usually having striped markings on the underside of the wings and thin filamentous projections from the hind wings
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Recent Examples of hairstreak from the Web
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The Fulvous hairstreak, another brown butterfly that feeds on Brazilian pepper, is now showing up north of Melbourne.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'hairstreak'. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
First Known Use of hairstreak
1815
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See words that rhyme with hairstreak Britannica.com: Encyclopedia article about hairstreak
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