Hep‐tav″a‐lent (?), a. [Hepta- + L. valens, p. pr. See Valence.] (Chem.) Having seven units of attractive force or affinity; — said of heptad elements or radicals.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.