Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

Comprehensive
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quad1 a large, open, usu. grassy area with buildings on all four sides, esp. on a college campus; quadrangle.
quad2 in printing, a piece of type that does not register, used for filling blank areas and spaces. [2 definitions]
quad3 a quadruplet.
quad4 quadraphonic. [2 definitions]
quad5 a unit of energy equal to one quadrillion British thermal units.