D defs.my
Entry 2 senses · 2 variants Webster, 1913

QED.

/(kū"ē*dē")/ · IPA
01 n. Quantum electrodynamics.
  1. 1.
    Quantum electrodynamics.[abbrev.]
02 interj. Which was demonstrated; -- a phrase used after the conclusion of some line of reasoning, especially in mathematical or logical proofs.
  1. 1.
    Which was demonstrated; -- a phrase used after the conclusion of some line of reasoning, especially in mathematical or logical proofs.[abbrev.]