Definition of quadri- combining form from the Oxford Advanced Learner's Dictionary

 

quadri-

 combining form
combining form
BrE BrE//ˈkwɒdrɪ//
 
; NAmE NAmE//ˈkwɑːdrɪ//
 
(also quadr-)
 
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(in nouns, adjectives and adverbs) four; having four quadrilateral quadruplet Word Originfrom Latin, from quattuor ‘four’.
See the Oxford Advanced American Dictionary entry: quadri-