Dictionary
quin•que•va•lent
Pronunciation: (kwing"kwu-vā'lunt, kwin"-, kwin-kwev'u-lunt, kwing-), [key]—
adj. Chem.
1. pentavalent.
2. exhibiting five valences, as phosphorus with valences 5, 4, 3, 1, and -3.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.