quadri-, quadra-, quad-, quadru- (Latin: four; a number used as a prefix).biquadrate: 
quadragenarian, quadragenary, quadragenarious: 
A person who is forty to forty-nine years old.
 
quadragesima: 
quadragesimal: 
quadrangle: 
quadrangular: 
quadrant: 
quadrantal: 
quadraphonic: 
quadraphonically: 
quadraphonics: 
quadraphony: 
quadraplegic: 
quadrat: 
quadrate: 
quadratic: 
quadratics: 
quadrature: 
quadrennia (plural): 
quadrennial: 
quadrennially: 
quadrennium (singular): 
quadric: 
quadricentennial: 
quadriceps: 
quadricycle: 
quadrifid: 
quadrifoliate: 
quadrifurcation: 
quadrigamist: 
quadrigamy: 
quadrilateral: 
quadrilingual: 
quadrille: 
quadrillion: 
quadrinomial: 
quadripartite: 
quadriphonic: 
quadriphonics: 
quadriplegia: 
quadriplegic: 
quadrireme: 
quadrisect: 
quadrisyllable: 
quadrivalent: 
quadrivium: 
quadroon: 
quadrophonic: 
quadrumane: 
quadrumanous: 
quadrumvirate: 
quadruped: 
quadrupedal: 
quadruple: 
quadruplet: 
quadruplets: 
quadruplex: 
quadruplicate: 
quadruplication: 
quadruplicity: 
quadruply: 
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