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 obscurantism
Pronunciation: əbˈskyo͝orənˌtizəm
noun
the practice of preventing facts from becoming known…