Definition of PDD
Medical Definition of PDD
pervasive developmental disorder Autism, Asperger syndrome, and pervasive developmental disorder-not otherwise specified (PDD-NOS) have been proposed to occur along a spectrum within PDD.—Susan L. Hyman, The Journal of the American Medical Association, 27 June 2001
Seen and Heard
What made you want to look up PDD? Please tell us where you read or heard it (including the quote, if possible).