/flay"meuhn/ , n. Animal Behav.
a behavioral response of many male mammals, esp. deer, antelope, and other artiodactyls, consisting of lip curling and head raising after sniffing a female's urine.
[ Flehmen, n. use of inf.: (of a domestic ungulate) to curl the lip; cf. dial. (Upper Saxony) flemmen to look spiteful; further relations unclear ]