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infantile autism

noun Psychology.
  1. a disorder appearing in children before the age of two and a half, characterized by lack of interest in others, impaired communication skills, and bizarre behavior, as ritualistic acts and excessive attachment to objects.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

infantile autism in Medicine

infantile autism

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