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heptavalent

[hep-tuh-vey-luh nt]
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adjective Chemistry.
  1. septivalent.

Origin of heptavalent

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for heptavalent

heptavalent

adjective
  1. chem having a valency of sevenAlso: septivalent
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012