'Cowlick' definitions:

Definition of 'cowlick'

(from WordNet)
noun
A tuft of hair that grows in a different direction from the rest of the hair and usually will not lie flat

Definition of 'Cowlick'

From: GCIDE
  • Cowlick \Cow"lick`\ (-l?k`), n. A tuft of hair turned up or awry (usually over the forehead), as if licked by a cow. [1913 Webster]