(psychology) Initialism of pervasive developmental disorder not otherwise specified.

(fluid mechanics) Initialism of positive displacement pump. / (electronics) Initialism of plasma display panel. / (informal) Abbreviation of pedophile.

(Philippines) Initialism of Philippine Development Plan.

Initialism of personality disorder not otherwise specified.

(in street addresses) Abbreviation of parade.

Initialism of People’s Democratic Republic of Ethiopia.

Alternative form of on the pdq

Initialism of Protein Digestibility Corrected Amino Acid Score (“method of evaluating the quality of a protein”).

Initialism of poly(diketoenamine).

(rail transport) Initialism of passenger dedicated line. / (computing) Initialism of pushdown list. / (computing) Initialism of page description language.