Definition of ogdoad in English:

ogdoad

Syllabification: og·do·ad
Pronunciation: /ˈäɡdəˌwad
 
/

noun

rare
A group or set of eight.

Origin

early 17th century: via late Latin from Greek ogdoas, ogdoad-, from ogdoos 'eighth', from oktō 'eight'.

Definition of ogdoad in:

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Word of the day internecine
Pronunciation: ˌintərˈnesēn
adjective
destructive to both sides in a conflict