Bible Dictionaries
Heptad
Webster's Dictionary
(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.
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Bibliography Information
Webster, Noah. Entry for 'Heptad'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/h/heptad.html. 1828.