The Collaborative International Dictionary of English v.0.48:

Vellicate \Vel"li*cate\, v. t. [imp. & p. p. Vellicated; p.
   pr. & vb. n. Vellicating.] [L. vellicatus, p. p. of
   vellicare to twitch, fr. vellere to pluck, pull.]
   To twitch; to cause to twitch convulsively.
   [1913 Webster]

         Convulsions, arising from something vellicating a nerve
         in its extremity, are not very dangerous. --Arbuthnot.
   [1913 Webster]