from The Century Dictionary and Cyclopedia
- n. In ornithology, a genus of swifts, of the family Cypselidæ; the spine-tailed swifts: so called because the shafts of the tail-feathers project beyond the webs in a hard, sharp point or mucro. There are many species, the best-known of which is the common black chimney-swift of the United States, Chætura pelagica.
- n. A genus of gastrotrichous Nematorhyncha.
- n. A genus of dipterous insects.
- n. A genus of protozoans.
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