octad

oc·tad

O0025900 (ŏk′tăd′)n. A group or sequence of eight.

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[Greek oktas, oktad-, from oktō, eight; see oktō(u) in Indo-European roots.]

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oc·tad′ic adj.

octad

(ˈɒktæd) n1. (Mathematics) a group or series of eight2. (Chemistry) chem an element or group with a valency of eight[C19: from Greek oktās, from oktō eight] ocˈtadic adj

oc•tad

(ˈɒk tæd)

n. 1. a group or series of eight. 2. an element, atom, or group having a valence of eight. [1835–45; < Greek oktad- (s. of oktás) group of eight =okt(ṓ) eight + -ad -ad¹] oc•tad′ic, adj.

Thesaurus

Noun

1.

octad - the cardinal number that is the sum of seven and one8, eight, eighter, eighter from Decatur, octet, octonary, ogdoad, VIIIdigit, figure - one of the elements that collectively form a system of numeration; "0 and 1 are digits"