Autism: a complex developmental disorder that appears in the first 3 years of life (though it may be diagnosed much later). It affects the brain's normal development of social and communication skills. Autism is a spectrum that encompasses a wide continuum of behavior. Core features include impaired social interactions, impaired verbal and nonverbal communication, and restricted and repetitive patterns of behavior. The symptoms may vary from quite mild to quite severe.

The links below will take you to additional detailed information about Autism.

Dorland's Medical Dictionary for Healthcare Consumers
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The Merck Manual—Home Edition
Access the essential health reference guide The Merck Manual—Home Edition. Discover in-depth information on all of your health and medical concerns.