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

 

tri-

 combining form
combining form
BrE BrE//traɪ//
 
; NAmE NAmE//traɪ//
 
 
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(in nouns and adjectives) three; having three tricycle triangular Word Originfrom Latin and Greek, from Latin tres, Greek treis ‘three’.
See the Oxford Advanced American Dictionary entry: tri-

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