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

 

hexa-

 combining form
combining form
BrE BrE//ˈheksə//
 
; NAmE NAmE//ˈheksə//
 
(also hex-)
 
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(in nouns, adjectives and adverbs) six; having six hexagon hexameter Word Originfrom Greek hex ‘six’.
See the Oxford Advanced American Dictionary entry: hexa-