crissal


cris·sum

C0751500 (krĭs′əm)n. pl. cris·sa (krĭs′ə) The feathers or area under the tail of a bird surrounding the cloacal opening.
[New Latin, from Latin crīsāre, crissāre, to move the buttocks during intercourse; see sker- in Indo-European roots.]
cris′sal (-əl) adj.