• Webster's Revised Unabridged Dictionary
    • n Spinetail (Zoöl) Any one or several species of swifts of the genus Acanthylis, or Chætura, and allied genera, in which the shafts of the tail feathers terminate in rigid spines.
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Century Dictionary and Cyclopedia
    • n spinetail In ornithology:
    • n spinetail A passerine bird of the family Dendrocolaptidæ, having stiff and more or less acuminate tail-feathers, much like a woodpecker's; a spine-tailed or sclerurine bird. See cuts under saberbill and Sclerurus.
    • n spinetail A cypseline bird of the subfamily Chæturinæ; a spine-tailed or chæturine swift, having mucronate shafts of the tail-feathers. See Acanthyllis, and cut under mucronate.
    • n spinetail The ruddy duck, Erismatura rubida.
    • n spinetail The log-runner, a bird of the genus Orthonyx. See log-runner.
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