Dictionary![]() ![]() cris•sumPronunciation: (kris'um), [key] —n., —pl. cris•saPronunciation: (kris'u). [key] Ornith. 1. the region surrounding the cloacal opening beneath the tail of a bird. 2. the feathers of this region collectively. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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