Definition of Atonic
Atonic: Without normal muscle tone or strength. An atonic seizure is one in which the person suddenly loses muscle tone and strength and cannot sit or stand upright and, unless supported, falls down.
Source: MedTerms™ Medical Dictionaryhttp://www.medterms.com/script/main/art.asp?articlekey=32942
Last Editorial Review: 6/2/2004
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