01 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 r…
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1.
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.(Chem.)