black swallow tail

black swallowtail

noun
See under swallowtail ( def 2 ).
Dictionary.com Unabridged

swallowtail

[swol-oh-teyl]
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) Compare spicebush swallowtail, tiger swallowtail, zebra swallowtail.

Origin:
1535–45; swallow2 + tail1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
swallowtail (ˈswɒləʊˌteɪl)
 
n
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.  short for swallow-tailed coat

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