swal·low·tail 
(swŏlŏ-tāl′)
(swŏlŏ-tāl′)n.
1.
a. The deeply forked tail of a swallow.
b. Something similar to the tail of a swallow.
2. See tailcoat.
3. 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.
- behavioral scientist
- behaviorism
- behaviorist
- behavioristic
- behavior modification
- behavior modifier
- behavior therapist
- behavior therapy
- behaviour
- behead
- beheld
- behemoth
- behest
- behind
- behind back
- behind bars
- behindhand
- behind (one's) back
- behind one's back
- behind the eight ball
- behind-the-scenes
- behind the scenes
- behind the times
- behind the wheel
- Behn