Definition of octo- in English:

octo-

Syllabification: octo-
(also oct- before a vowel)

combining form

Eight; having eight: octosyllabic

Origin

from Latin octo or Greek oktō 'eight'.

Definition of octo- in:

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Word of the day antebellum
Pronunciation: ˌantēˈbeləm
adjective
occurring or existing before a particular war…