Definition of quadruplet noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈkwɒdrʊplət//
; NAmE NAmE//ˈkwɑːdrʊplət//
; BrE BrE//kwɒˈdruːplət//
; NAmE NAmE//kwɑːˈdruːplət//
(also quad)
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one of four children born at the same time to the same mother Word Origin late 18th cent.: from quadruple, on the pattern of triplet.
See the Oxford Advanced American Dictionary entry: quadruplet