The Collaborative International Dictionary
Octavalent
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.
Wiktionary
octavalent
a. (context chemistry English) having a valence of 8