heptad

hep·tad

H0155300 (hĕp′tăd′)n. A group or series of seven.

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[Greek heptas, heptad-, the number seven, from hepta, seven; see septm̥ in Indo-European roots.]

heptad

(ˈhɛptæd) n1. (Mathematics) a group or series of seven2. (Mathematics) the number or sum of seven3. (Chemistry) an atom or element with a valency of seven[C17: from Greek heptas seven]

hep•tad

(ˈhɛp tæd)

n. 1. the number seven. 2. a group of seven. [1650–60; < Greek heptad-, s. of heptás. See hepta-, -ad¹]

Thesaurus

Noun

1.

heptad - the cardinal number that is the sum of six and one7, septenary, septet, seven, sevener, VIIdigit, figure - one of the elements that collectively form a system of numeration; "0 and 1 are digits"