Definition of octa- in English:

octa-

Pronunciation: /ˈɒktə/
(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 hypnopompic
Pronunciation: ˌhɪpnə(ʊ)ˈpɒmpɪk
adjective
relating to the state immediately preceding waking up