01 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 term…
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1.
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.(Zool.) [Local, U.S.]