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2 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 crissum
 圍肛羽; 肛周

From: Webster's Revised Unabridged Dictionary (1913)

 Cris·sum , n.; pl. Crissa   Zool. That part of a bird, or the feathers, surrounding the cloacal opening; the under tail coverts.
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