Crissum

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Crissum \Cris"sum\ (kr?s"s?m),, n.; pl. {Crissa} (-s?). [NL.;
     cf. L. crisso to move the haunches.] (Zool.)
     That part of a bird, or the feathers, surrounding the cloacal
     opening; the under tail coverts.
     [1913 Webster]