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

 

octo-

 combining form
combining form
BrE BrE//ˈɒktəʊ//
 
; NAmE NAmE//ˈɑːktoʊ//
 
(also oct-)
 
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(in nouns, adjectives and adverbs) eight; having eight octagon Word Originfrom Latin octo or Greek oktō ‘eight’.
See the Oxford Advanced American Dictionary entry: octo-