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heptad
Definition of heptad (English)
noun
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the cardinal number that is the sum of six and onesumber: wordnet30
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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.sumber: webster1913