Definition of quod erat demonstrandum in English:

quod erat demonstrandum

Syllabification: quod e·rat de·mon·stran·dum
Pronunciation: /kwäd ˈerət ˌdemənˈsträndəm
 
/
(abbreviation: QED)

noun

Used to convey that a fact or situation demonstrates the truth of one’s theory or claim, especially to mark the conclusion of a formal proof.

Origin

Latin, literally 'which was to be demonstrated'.

Definition of quod erat demonstrandum in:

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Pronunciation: ˈgʌz(ə)l
verb
eat or drink (something) greedily