Chemistry. an atom or atomic group that takes the place of another atom or group present in the molecule of the original compound.
having been or capable of being substituted.
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How to use substituent in a sentence
Here we have assumed the substituent groups to be alike; when they are unlike, a greater number of isomers is possible.
British Dictionary definitions for substituent
chem an atom or group that replaces another atom or group in a molecule or can be regarded as replacing an atom in a parent compound
substituted or substitutable
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