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Definition of Crissum
1. n. That part of a bird, or the feathers, surrounding the cloacal opening; the under tail coverts.
Definition of Crissum
1. a region of feathers on a bird [n CRISSA] : CRISSAL [adj]
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1. n. That part of a bird, or the feathers, surrounding the cloacal opening; the under tail coverts.
1. a region of feathers on a bird [n CRISSA] : CRISSAL [adj]