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octad

Noun

oc=tad

WORDNET DICTIONARY

octad(n = noun.quantity) 8, eight, eighter, eighter from decatur, octet, octonary, ogdoad, viii - the cardinal number that is the sum of seven and one; Array

is a kind of digit, figure

octad, n. [Gr. , , the number eight.].

An atom or radical which has a valence of eight, or is octavalent. [1913 Webster]
A group of eight things. [PJC]

octad, n. a group of eight.

Etymology

LL octas octad- f. Gk oktas -ados f. okto eight

For further exploring for "octad" in Webster Dictionary Online