having a tail or end extended in forked points like the tail of a swallow
swallow-tailed in American English
(ˈswɑlouˌteild)
adjective
1.
having a deeply forked tail like that of a swallow, as various birds
2.
having an end or part suggesting a swallow's tail
3. (of a flag)
having a triangular indentation in the fly so as to create two tails
Word origin
[1690–1700]This word is first recorded in the period 1690–1700. Other words that entered Englishat around the same time include: freshen, manta, migrate, momentum, synthetic