Apterium

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    An area of bare (featherless) skin on a bird.

    "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."

Example

More examples

"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."

Etymology

From a- + Ancient Greek πτερόν (pterón, “feather”) + -ium. Compare Ancient Greek ἄπτερος (ápteros, “featherless”).

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.