formication Meaning, Definition & Usage

  1. noun hallucinated sensation that insects or snakes are crawling over the skin; a common side-effect of extensive use of cocaine or amphetamines

WordNet

For`mi*ca"tion noun
Etymology
L. formicatio, fr. formicare to creep like an ant, to feel as if ants were crawling on one's self, fr. formica ant: cf. F. formication.
Definitions
  1. (Med.) A sensation resembling that made by the creeping of ants on the skin. Dunglison.

Webster 1913