substituent

[suhb-stich-oo-uhnt]

sub·stit·u·ent

[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.

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Substituent is always a great word to know.
So is titanic. Does it mean:
of or containing titanium, especially in the tetravalent state or three valence state
any of a number of polymers containing alternate silicon and oxygen atoms and that are fluid, resinous, rubbery, extremely stable in high temperatures, and water-repellent

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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