swallowtail
Pronunciation:
/ˈswɒl.əʊˌteɪl/noun
Definitions
The forked tail of a swallow.
Anything, such as a burgee, of a similar forked shape.
A type of tailcoat with two long tapering tails.Wp
Any of various butterflies of the family Papilionidae, many of which have a long extension to each hindwing.