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.

Tic douloureux. [F., fr. tic a knack, a twitching + douloureux painful.]

(Med.) Neuralgia in the face; face ague. See under Face.

Source: Webster's Revised Unabridged Dictionary (1913)