Definitions from Wiktionary (PDD)

▸ noun:  (psychology) Initialism of pervasive developmental disorder. [(psychiatry) Any of a group of disorders characterized by delays in the development of multiple basic functions including socialization and communication. They were five in the DSM-IV: Asperger syndrome, autism, childhood disintegrative disorder, Rett syndrome, and PDD-NOS.]
▸ noun:  (organic chemistry) Initialism of paraphenylenediamine. [(organic chemistry) The para- isomer of phenylenediamine]
▸ noun:  (medicine) Initialism of photodynamic diagnosis.
▸ noun:  (UK politics) Initialism of People Demand Democracy.



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