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PDD
++/-- Pervasive Developmental Disorder
+/--- pervasive development disorder
/---- Precision Depth Digitizer
AcroLexic: Dictionary of Acronyms and Abbreviations contains 13 more definitions of “PDD”.
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See also

Acronym Definitions
CPDD 7
PDDR 2
IPDD 2
PDDI 2
OPDD 2
PPDD 1
FPDD 1