octad Meaning, Definition & Usage
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noun the cardinal number that is the sum of seven and one
ogdoad; octet; eight; VIII; eighter; 8; eighter from Decatur; octonary.
WordNet
Oc"tad noun
Etymology
Gr. , , the number eight.Definitions
(Chem.) An atom or radical which has a valence of eight, or is octavalent.