The Collaborative International Dictionary
Pentavalent
Pentavalent \Pen*tav"a*lent\, a. [Penta- + L. valens, p. pr. See Valence.] (Chem.) Having a valence of five; -- said of certain atoms and radicals.
Wiktionary
pentavalent
a. (context inorganic chemistry English) having a valence of 5
WordNet
pentavalent
adj. having a valence of five
Usage examples of "pentavalent".
Among other things, the rules predicted that if a graph contained a loop consisting of three trivalent nodes alternating with three pentavalent ones, its most likely successors would share the same pattern, but it would be shifted to an adjoining set of nodes.