Definition of oct- in English:

oct-

Syllabification: oct-

combining form

Variant spelling of octa- and octo- assimilated before a vowel (as in octennial).

Definition of oct- in:

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Word of the day oleaginous
Pronunciation: ˌəʊlɪˈadʒɪnəs
adjective
rich in, covered with, or producing oil; oily