a. (Zool.) Having the outer tail feathers longer than the median ones; swallow-tailed; -- said of many birds. [ 1913 Webster ]
Fork-tailed flycatcher (Zool.), a tropical American flycatcher (Milvulus tyrannus). -- Fork-tailed gull (Zool.), a gull of the genus Xema, of two species, esp. X. Sabinii of the Arctic Ocean. -- Fork-tailed kite (Zool.), a graceful American kite (Elanoides forficatus); -- called also swallow-tailed kite. [ 1913 Webster ]