(1):
(n.) Any one or several species of swifts of the genus Acanthylis, or Chaetura, and allied genera, in which the shafts of the tail feathers terminate in rigid spines.
(2):
(n.) Any one of several species of South American and Central American clamatorial birds belonging to Synallaxis and allied genera of the family Dendrocolaptidae. They are allied to the ovenbirds.
(3):
(n.) The ruddy duck.