apterium

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English[edit]

Etymology[edit]

See aptera.

Noun[edit]

apterium (plural apteria)

  1. (ornithology) An area of bare (featherless) skin on a bird.
    • 1918, American Ornithologists' Union, The Auk[1]:
      The two halves of the lower cervical tract are still separated by an apterium 4 mm. wide, as in the young bird, but contour feathers are now present on the chin and upper throat, so that they are united at their upper ends.

Antonyms[edit]