Pronunciation: (swol'ō-tāl"), [key]
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). Cf. spicebush swallowtail, tiger swallowtail, zebra swallowtail.
3. See tail coat.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.