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 oleaginous
Pronunciation: ˌəʊlɪˈadʒɪnəs
adjective
rich in, covered with, or producing oil; oily