substituent[sub stic̸h′o̵̅o̅ ənt]
substituent definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
Chem. an atom or group of atoms replacing another atom or group in a compound
Origin: ; from Classical Latin substituens, present participle of substituere: see substitute
substituent definition by American Heritage Dictionary
An atom, radical, or group substituted for another in a chemical compound.adjective
Of or relating to such an atom or group.
Origin: Latin substituēns, substituent-, present participle of substituere, to substitute; see substitute.