Definition of hepta- in English:

hepta-

Pronunciation: /ˈhɛptə/

combining form

Seven; having seven: heptagon heptathlon

Origin

from Greek hepta 'seven'.

Definition of hepta- in:

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Word of the day hypnopompic
Pronunciation: ˌhɪpnə(ʊ)ˈpɒmpɪk
adjective
relating to the state immediately preceding waking up