Flycatcher \Fly"catch`er\, n. (Zo["o]l.) One of numerous species of birds that feed upon insects, which they take on the wing.

Note: The true flycatchers of the Old World are Oscines, and belong to the family Muscicapid[ae], as the spotted flycatcher (Muscicapa grisola). The American flycatchers, or tyrant flycatchers, are Clamatores, and belong to the family Tyrannid[ae], as the kingbird, pewee, crested flycatcher (Myiarchus crinitus), and the vermilion flycatcher or churinche (Pyrocephalus rubineus). Certain American flycatching warblers of the family Sylvicolid[ae] are also called flycatchers, as the Canadian flycatcher (Sylvania Canadensis), and the hooded flycatcher (S. mitrata). See Tyrant flycatcher.

Source: Webster's Revised Unabridged Dictionary (1913)