pentavalent

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pentavalent

Chem having a valency of five
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

pentavalent

[¦pen·tə′vā·lənt]
(chemistry)
An atom or radical that exhibits a valency of 5.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.