Principle of double effect

Present Day English

"Parade" on street signs

Program development environment, an editing and debugging tool used during software development

Partial differential equation, a differential equation involving partial derivatives of a function of several variables.

European Democratic Party (EDP), in Spanish, French and Italian.

Phosphodiesterase, a kind of enzyme important in intracellular communication.

Pulse detonation engine, a kind of aircraft engine.