Last Updated
：2025/11/28
apterium
Sense（1）
（ plural ）
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(ornithology) An area of bare (featherless) skin on a bird.
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apterium
The biologist carefully photographed the apterium beneath the sparrow's wing to document the extent of feather loss.
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The biologist carefully photographed the apterium beneath the sparrow's wing to document the extent of feather loss.
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