Etymology
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Words related to quad

quadrangle (n.)

late 14c., "a plane figure having four angles; a rectangle, square, etc.," from Old French quadrangle (13c.) and directly from Late Latin quadrangulum "four-sided figure," noun use of neuter of Latin adjective quadrangulus "having four corners," from Latin quattuor "four" (from PIE root *kwetwer- "four") + angulus "angle" (see angle (n.)). Meaning "four-sided court nearly surrounded by buildings" is from 1590s.

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quadrat (n.)

"a blank, low-cast type used by typographers to fill in larger spaces at the end of or between printed lines," 1680s, from French quadrat "a quadrat," literally "a square," from Latin quadratrus, past participle of quadrare "to make square," related to quadrus "a square," quattuor "four" (from PIE root *kwetwer- "four"). Earlier in English it meant a type of surveying instrument with a square plate (c. 1400).

quadruplet (n.)

"one of four children at a single birth," 1787; from quadruple (adj.) with ending from triplet. Related: Quadruplets. Meaning "any combination of four objects or parts grouped, united, or acting together" is by 1852. Musical sense of "group of four notes to be played in the time of three notes" is by 1873.

quadraphonic (adj.)

1969, irregular hybrid formation from Latin-derived quadri- "four" + phonic, from Greek phonē "sound, voice" (from PIE root *bha- (2) "to speak, tell, say"). The goal was to reproduce front-to-back sound distribution in addition to side-to-side stereo. The later term for the same idea, surround sound, is preferable to this. Quadrasonic (1970) was at least not a hybrid. Related: Quadraphonics; quadraphony.

quod (n.)

"prison," c. 1700, a cant slang word of unknown origin; perhaps a variant of quad in the "building quadrangle" sense.