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1. (n.) heptad
the number seven.
2. heptad
a group of seven.
Etymology: (1650–60; < Gk heptad-, s. of heptás. See hepta -, -ad1)
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| Definition of 'heptad' |
Princeton's WordNet |
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1. (noun) seven, 7, VII, sevener, heptad, septet, septenary
the cardinal number that is the sum of six and one
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| Definition of 'heptad' |
Webster Dictionary |
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1. (noun) heptad
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
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| Definitions of 'heptad' |
The Nuttall Encyclopedia |
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1. heptad
a term in chemistry to denote an atom that is the equivalent of seven atoms of hydrogen, from hepta, seven.
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Definitions of heptad 
