apterium

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Definition of apterium

1 sense · 1 part of speech · etymology included

noun

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.”

Definitions from Wiktionary, CC BY-SA.

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

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