'Tic' definitions:

Definition of 'tic'

From: WordNet
noun
A local and habitual twitching especially in the face

Definition of 'Tic'

From: GCIDE
  • Tic \Tic\, n. [F.] (Med.) A local and habitual convulsive motion of certain muscles; especially, such a motion of some of the muscles of the face; twitching; velication; -- called also spasmodic tic. --Dunglison. [1913 Webster]
  • Tic douloureux. [F., fr. tic a knack, a twitching + douloureux painful.] (Med.) Neuralgia in the face; face ague. See under Face. [1913 Webster]

Synonyms of 'tic'

From: Moby Thesaurus