Definition of heptad Heptad

hep•tad

We found 4 definitions of heptad from 4 different sources.

What does heptad mean?

Noun
heptad - the cardinal number that is the sum of six and one
		seven, 7, VII, sevener, septet, septenary
		digit, figure a finger or toe in human beings or corresponding body part in other vertebrates

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heptad (n.)
An atom which has a valence of seven, and which can be theoretically combined with, substituted for, or replaced by, seven monad atoms or radicals; as, iodine is a heptad in iodic acid. Also used as an adjective.