HEPTAD Definition & Meaning

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heptad

[ hep-tad ]

Phonetic (Standard)IPA

noun

the number seven.
a group of seven.
Chemistry. an element, atom, or group having a valence of seven.

heptad

/ ˈ��ɛ��æ�� /

noun

a group or series of seven
the number or sum of seven
an atom or element with a valency of seven

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�y��vlog History and Origins

Origin of heptad¹

First recorded in 1650–60, heptad is from the Greek word heptad- (stem of ��á�� ). See hepta-, -ad ¹

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�y��vlog History and Origins

Origin of heptad¹

C17: from Greek heptas seven

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Example Sentences

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Seven, or the heptad, is a number very powerful for good or for evil.

From

Thus one of the Meta molecules of iron, containing seven atoms, is identical in appearance with a Hyper heptad, but the latter dissociates into seven atoms, the former into two triads and a single atom.

From

Colours may best be expressed by a heptad, the largest possible formula for things finite, as the pentad is the smallest possible form.

From

The word pentad at once recalls to you the way in which the chemist speaks of a monad, triad, heptad, when he deals with elements.

From

Indeed, the heptad of things finite is in all cases reducible to the pentad.

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