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crissum |
1 definition found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Crissum \Cris"sum\ (kr?s"s?m),, n.; pl {Crissa} (-s?). [NL.; cf L. crisso to move the haunches.] (Zo["o]l.) That part of a bird, or the feathers, surrounding the cloacal opening; the under tail coverts.