verb (v)

• touch (a body part) lightly so as to excite the surface nerves and cause uneasiness, laughter, or spasmodic movements(verb.perception)

  Synonym:
  tickle, titillate
  

  source: wordnet30
• irritate as if by a nip, pinch, or tear(verb.change)

  Example:
  Smooth surfaces can vellicate the teeth.
  

  Synonym:
  pinch
  

  source: wordnet30
• To twitch; to cause to twitch convulsively.(verb)

  source: webster1913
• To move spasmodically; to twitch; as, a nerve vellicates.(verb)

  source: webster1913