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单词 crissum
释义 crissum Ornith.|ˈkrɪsəm|
[mod.L. (1811 Illiger, Prodromus 166), f. crissāre ‘clunem movere’.]
The anal region of a bird under the tail; the vent-feathers or lower tail-coverts.
1874Coues Birds N.W. 314 There is more dark color on the crissum.
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