- something having a forked shape like that of a swallow's tail
- any of a large family (Papilionidae) of brightly colored butterflies found worldwide, having the hind wings extended in taillike points
- a. The deeply forked tail of a swallow.b. Something similar to the tail of a swallow.
- See tailcoat.
- Any of various colorful, widely distributed butterflies of the family Papilionidae, usually having an extension at the end of each hind wing that resembles the tail of certain swallows.