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myoclonic astatic epilepsy

n.
  1. A form of petit mal occurring in children with neurologic disabilities and mental retardation and characterized by atonic seizures and tonic-clonic attacks that generally are not halted by medication.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.