(mathematical analysis) Initialism of partial differential equation. / (software) Initialism of plugin development environment. / Initialism of pulse detonation engine.

(linguistics) Initialism of present-day English.

(polymers) Initialism of polydimethylsiloxane.

Initialism of plan-do-check-act: a four-step process typically used in quality control.

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

Initialism of Personal Digital Cellular. A 2G mobile standard.

Initialism of program delivery control.

plural of pdoc

(Internet slang) A psychotherapist or psychiatrist.

plural of PDF