(physics) The theory that (most) baryons and mesons are composed of bound quarks and antiquarks.

(physics) A model organizing baryons and mesons according to their composition of bound quarks and antiquarks in groups of two or three; part of the Standard Model.

plural of quarentene

Obsolete form of quarantine (“widow's grace period”).

(music) The musical interval equal to one quarter of a tone or 1/24 of an octave; half a semitone.

(history of numismatics) A British coin, produced for circulation in Ceylon 1839–1853, which, at a face value of ⅟₁₆d. (£⅟₃₈₄₀), is the lowest denomination of coin ever minted for the United Kingdom.

(historical) A block on which the body of a condemned criminal was quartered.

plural of quarter day

(now chiefly historical) A machine designed to crush quartz in order to extract gold.

plural of quartz crusher