In organic chemistry and biochemistry, a substituent is an atom or group of atoms substituted in place of a hydrogen atom on the parent chain of a hydrocarbon. The terms substituent, side-chain, group, branch, or pendant group are used almost interchangeably to describe branches from a parent structure, though certain distinctions are made in the ...
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http://en.wikipedia.org/wiki/Substituent
• (n.) Any atom, group, or radical substituted for another, or entering a molecule in place of some other part which is removed.
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http://thinkexist.com/dictionary/meaning/substituent/
An atom or group of bonded atoms that can be considered to have replaced a hydrogen atom (or two hydrogen atoms in the special case of bivalent groups) in a parent molecular entity (real or hypothetical).
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http://www.chem.qmul.ac.uk/iupac/gtpoc/StSy.html
An atom or group that replaces another atom or group in a molecule.
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http://www.chemicalglossary.net/definition/1514-Substituent
(sәb-stich´u-әnt) pertaining to substitution. substitute (def. 2). the component substituted in a substitution reaction.
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http://www.encyclo.co.uk/local/21001
Sub·stit'u·ent noun [ Latin
substituens , present participle See
Substitute .]
(Chemistry) Any atom, group, or radical substituted for another, or entering a molecule in place of some other part which is removed.
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http://www.encyclo.co.uk/webster/S/228
Type: Term Pronunciation: sŭb-sti′chū-ĕnt Definitions: 1. A functional group that has replaced another moiety and molecular entity.
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http://www.medilexicon.com/medicaldictionary.php?t=86098
an atom or atomic group that takes the place of another atom or group present in the molecule of the original compound.
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https://www.infoplease.com/dictionary/substituent
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