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