substituent

substituent

[suhb-stich-oo-uhnt]
noun
1.
Chemistry. an atom or atomic group that takes the place of another atom or group present in the molecule of the original compound.
adjective
2.
having been or capable of being substituted.

Origin:
1890–95; < Latin substituent- (stem of substituēns), present participle of substituere to substitute, equivalent to sub- sub- + -stitu-, combining form of statuere to set up, erect (see statue) + -ent- -ent

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World English Dictionary
substituent (sʌbˈstɪtjʊənt)
 
n
1.  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
 
adj
2.  substituted or substitutable
 
[C19: from Latin substituere to substitute]

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