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From The Collaborative International Dictionary of English v.0.48:
Octavalent \Oc*tav"a*lent\, a. [Octa- + L. valens, p. pr. See Valence.] (Chem.) Having a valence of eight; capable of being combined with, exchanged for, or compared with, eight atoms of hydrogen; -- said of certain atoms or radicals. [1913 Webster]