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单词 θ38729
释义
the world > animals > birds > parts of or bird defined by > [noun] > beak or bill > covering of (2)
sheath1781

A sheath-like covering. Applied to various animal and vegetable structures. ‘The horny covering of the bill or feet of a bird; esp. a sort of…

rhamphotheca1870

The modified integument, usually horny but in some birds leathery, that covers a bird's jaws and forms the outer layer of the bill.

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更新时间:2024/9/23 13:19:52