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swallowtail

[swol-oh-teyl] /ˈswɒl oʊˌteɪl/
noun
1.
the tail of a swallow or a deeply forked tail like that of a swallow.
2.
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)
3.
Origin
1535-1545
1535-45; swallow2 + tail1
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for swallow-tail

swallowtail

/ˈswɒləʊˌteɪl/
noun
1.
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
2.
the forked tail of a swallow or similar bird
3.
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for swallow-tail

swallowtail

1540s, of a type of arrowhead, from swallow (n.) + tail (n.). Of a type of butterfly, by 1776; of a type of coat, 1835.

Online Etymology Dictionary, © 2010 Douglas Harper
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13
15
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