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