n. (Zool.) Any one of numerous species of passerine birds of the family Hirundinidæ, especially one of those species in which the tail is deeply forked. They have long, pointed wings, and are noted for the swiftness and gracefulness of their flight. The most common North American species are the barn swallow the cliff, or eaves, swallow (see under Cliff), the white-bellied, or tree, swallow (Tachycineta bicolor), and the bank swallow The common European swallow and the window swallow, or martin are familiar species.
- (Zool.) Any one of numerous species of swifts which resemble the true swallows in form and habits, as the common American chimney swallow, or swift.
- (Naut.) The aperture in a block through which the rope reeves.
- Swallow plover (Zool.), any one of several species of fork-tailed plover like birds of the genus Glareola, as G. orientalis of India; a pratincole.
- Swallow shrike (Zool.), any one of several species of East Indian and Asiatic birds of the family Artamiidæ, allied to the shrikes but similar to swallows in appearance and habits. The ashy swallow shrike (Artamus fuscus) is common in India.