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incubation patch

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noun
a highly vascular, featherless area developed on the abdomen of certain brooding birds that is in direct contact with eggs during incubation and provides additional warmth.
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Also called brood patch.

Origin of incubation patch

First recorded in 1950–55
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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