Qed
//ˌkjuːiːˈdiː// noun, phrase
noun, phrase ·Rare ·Advanced level
Definitions
Noun
- 1 (Partial) initialism of quantum electrodynamics. uncountable
"QCD is a theory of quark interactions much analogous to QED: the interaction is carried by "gluons" (analogous to photons) which couple to the "color" (analogous to charge) of the quarks."
- 2 a relativistic quantum theory of the electromagnetic interactions of photons and electrons and muons wordnet
Phrase
- 1 Alternative form of Q.E.D.; Initialism of quod erat demonstrandum. alt-of, alternative
"[A]fter the ſame manner S and U are proved to be equal, therefore the ſquare of CB is equal to the ſquare of the 2 other ſides QED."
Example
More examples"QCD is a theory of quark interactions much analogous to QED: the interaction is carried by "gluons" (analogous to photons) which couple to the "color" (analogous to charge) of the quarks."
Etymology
Etymology 1
From q(uantum) e(lectro)d(ynamics).
Etymology 2
See Q.E.D.
Related phrases
More for "qed"
Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.