‖Cris″sum (kr?s″s?m),, n.; pl.Crissa (–s�). [NL.; cf. L. crisso to move the haunches.] (Zoöl.) That part of a bird, or the feathers, surrounding the cloacal opening; the under tail coverts.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.