Definitions

from The Century Dictionary.

  • noun In ornithology, a tract or space on the skin of a bird where no feathers grow; an unfeathered tract, in distinction from a feather-tract or pteryla (which see). Nitzsch; Sundevall.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun ornithology An area of bare (featherless) skin on a bird.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

See aptera.

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Examples

  • "You would not destroy the godling," Sargonnas croaked, fire and sunlight brindling over his mottled apterium.

    The Dark Queen Williams, Michael, 1952 Dec. 17- 1994

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