English dictionary
heptad
/'h/E/pt/&/d/
Definitions, examples, synonyms and antonyms from WordNet 3.0.
noun
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the cardinal number that is the sum of six and one
Source: WordNet 3.0
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An atom which has a valence of seven, and which can be theoretically combined with, substituted for, or replaced by, <i>seven</i> monad atoms or radicals; as, iodine is a <i>heptad</i> in iodic acid. Also used as an adjective.
Source: webster1913