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Definition of octo- combining form from the Oxford Advanced American Dictionary

 

octo-

 combining form
combining form
NAmE//ˈɑktoʊ//
 
, NAmE//ˈɑktə//
 
(also oct-)
 
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(in nouns, adjectives, and adverbs) eight; having eight octagon
See octo- in the Oxford Advanced Learner's Dictionary
Check pronunciation: octo-

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