Definition of octa- in English:

octa-

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

combining form

Eight; having eight: octahedron

Origin

from Greek oktō 'eight'.

Definition of octa- in:

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