quinquivalent, a. Chem.
(kwɪnˈkwɪvələnt)
[f. L. quinqui- five- + valent as in equivalent, quadrivalent.]
Capable of combining with five univalent atoms; pentavalent.
| 1877 Watts Fownes' Chem. I. 256 Quinquivalent elements, or Pentads. 1880 E. Cleminshaw Wurtz' Atom. Th. 229 It is quinquivalent in chloric acid. 1885 I. Remsen Org. Chem. (1888) 209 In contact with certain substances it [the nitrogen] becomes quinquivalent. |