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swallowtail

[ swol-oh-teyl ]
/ ˈswɒl oʊˌteɪl /
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noun

the tail of a swallow or a deeply forked tail like that of a swallow.
any of several butterflies of the genus Papilio, characterized by elongated hind wings that resemble the tail of a swallow, as P. polyxenes(black swallowtail ).Compare spicebush swallowtail, tiger swallowtail, zebra swallowtail.

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Origin of swallowtail

First recorded in 1535–45; swallow2 + tail1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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British Dictionary definitions for swallowtail

swallowtail
/ (ˈswɒləʊˌteɪl) /

noun

any of various butterflies of the genus Papilio and related genera, esp P. machaon of Europe, having a tail-like extension of each hind wing: family Papilionidae
the forked tail of a swallow or similar bird
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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