crissum
Cris"sum (krs"sm),, n.; pl. Crissa (-s. Etym: [NL.; cf. L. crisso to move the haunches.] (Zoöl.) Defn: That part of a bird, or the feathers, surrounding the cloacal opening; the under tail coverts.
Cris"sum (krs"sm),, n.; pl. Crissa (-s. Etym: [NL.; cf. L. crisso to move the haunches.] (Zoöl.) Defn: That part of a bird, or the feathers, surrounding the cloacal opening; the under tail coverts.