ogdoad
A thing made up of eight parts.
Probably these, as in the other systems, made the second Ogdoad; and these, with other astral influence, borrowed from the Tsabaism of the region, the twelve signs of the zodiac, and the thirty-six Decani
Where it comes from
From Ancient Greek ὀγδοάς (ogdoás, “eight, a group of eight”). By surface analysis, ogdo- + -ad.
Adapted from the Wiktionary entry ogdoad (CC BY-SA 4.0).