ogdoad

og·do·ad

[og-doh-ad]
noun
1.
the number eight.
2.
a group of eight.

Origin:
1615–25; < Late Latin ogdoad- (stem of ogdoas) < Greek ogdoás, derivative of ógdoos eighth; see -ad1

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ogdoad (ˈɒɡdəʊˌæd) [Click for IPA pronunciation guide]
 
n
a group of eight
 
[C17: via Late Latin from Greek ogdoos eighth, from oktō eight]

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Ogdoad is always a great word to know.
So is quincunx. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
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