swallowtails

/S W AA1 L OW0 T EY0 L Z/
noun
  1. 1

    The forked tail of a swallow.

  2. 2

    Anything, such as a burgee, of a similar forked shape.

  3. 3

    A type of tailcoat with two long tapering tails.Wp

  4. 4

    Any of various butterflies of the family Papilionidae, many of which have a long extension to each hindwing.

Source: https://en.wiktionary.org/wiki/swallowtail, https://en.wiktionary.org/wiki/swallowtails