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septivalent

or sep·ta·va·lent

[sep-tuh-vey-luh nt]
adjective Chemistry.
  1. having a valence of seven; heptavalent.
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Origin of septivalent

First recorded in 1870–75; septi- + -valent
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for septivalent

septivalent

septavalent (ˌsɛptəˈveɪlənt)

adjective
  1. chem another word for heptavalent
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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