Etymology
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formication (n.)

crawling sensation as of ants on the skin, 1707, from Latin formicationem (nominative formicatio), noun of action from formicare "to crawl like ants," from formica "ant" (see Formica (n.2)).

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Definitions of formication

formication (n.)
hallucinated sensation that insects or snakes are crawling over the skin; a common side-effect of extensive use of cocaine or amphetamines;
From wordnet.princeton.edu