a tactile hallucination involving the belief that something is crawling on the body or under the skin.

1700–10; < Latin (Pliny) formīcātiōn-, stem of formīcātiō a sensation that ants are crawling on one's skin, equivalent to formicā(re) to have such a sensation (verbal derivative of formīca ant) + -tiōn- -tion

formication, fornication. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
formication (ˌfɔːmɪˈkeɪʃən)
a sensation of insects crawling on the skin; symptom of a nerve disorder

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1707, from L. formicationem, noun of action from formicare to crawl like ants, from formica "ant."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

formication for·mi·ca·tion (fôr'mĭ-kā'shən)
An abnormal sensation as of insects running over or into the skin, associated with cocaine intoxication or disease of the spinal cord and peripheral nerves.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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