chætura

from The Century Dictionary.

• noun 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.
• noun A genus of gastrotrichous Nematorhyncha.
• noun A genus of dipterous insects.
• noun A genus of protozoans.