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From The Collaborative International Dictionary of English v.0.48:
Vellication \Vel`li*ca"tion\, [L. vellicatio.] 1. The act of twitching, or of causing to twitch. [1913 Webster] 2. (Med.) A local twitching, or convulsive motion, of a muscular fiber, especially of the face. [1913 Webster]