substituent

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sub·stit·u·ent

 (səb-stĭch′o͞o-ənt)
n.
An atom or group substituted for another in a chemical compound.
adj.
Of or relating to such an atom or group.

[Latin substituēns, substituent-, present participle of substituere, to substitute; see substitute.]

substituent

(sʌbˈstɪtjʊənt)
n
(Chemistry) 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
substituted or substitutable
[C19: from Latin substituere to substitute]

sub•stit•u•ent

(sʌbˈstɪtʃ u ənt)

n.
an atom or atomic group that takes the place of another atom or group present in the molecule of the original compound.
[1890–95; < Latin substituent-, s. of substituēns, present participle of substituere to substitute; see -ent]
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