Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun An atom or group substituted for another in a chemical compound.
  • adjective Of or relating to such an atom or group.

from The Century Dictionary.

  • noun That which substitutes; in chem., an atom or atomic group which takes the place of another atom or group present in the molecule of the original compound. Thus in the compounds methane (CH4) and methyl alcohol (CH3OH), OH is said to be the substituent.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Chem.) Any atom, group, or radical substituted for another, or entering a molecule in place of some other part which is removed.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun chemistry any atom, group, or radical substituted for another, or entering a molecule in place of some other part which is removed

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

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

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Examples

  • Would the substituent fractions all have faced the same exact problems?

    Matthew Yglesias » Too Big to Exist 2008

  • The other contribution is the synthesis of liquid crystalline conjugated polymers by replacing the hydrogen atom bonded to polyacetylene with a substituent having liquid crystalline nature as the side chain.

    Hideki Shirakawa - Autobiography 2001

  • Deci, această secţiune este prezentat aici ca un substituent, un monument mici pentru a optimismul meu.

    ideonexus.com »2003» October 2003

  • My first scientific paper in 1961 reported an additivity rule for substituent induced shifts of proton NMR signals in steroid derivatives.

    Jean-Marie Lehn - Autobiography 1988

  • Biogenesis becomes reproduction; re - production becomes cellular; cell division becomes mitotic; chromosomes split longitudinally, or put more accurately, they replicate themselves, since each new chromosome is no half-chromosome but a chromosome entire; and finally, the substituent elements of the chromosomes, whether visible chromatids or invisible genes, are held likewise to replicate themselves.

    GENETIC CONTINUITY BENTLEY GLASS 1968

  • The complementary substances or substituent groups with which these nuclei are more or less firmly combined in nature exert a stabilizing and perhaps otherwise favorable influence on the curative nucleus, but do not themselves possess the vitamine type of physiological potency.

    The Vitamine Manual Walter H. Eddy

  • These molecules are particularly important in biochemistry, where this term refers to alpha-amino acids with the general formula H2NCHRCOOH, where R is an organic substituent.

    WN.com - Articles related to Plants give up some deep secrets of drought resistance 2010

  • These molecules are particularly important in biochemistry, where this term refers to alpha-amino acids with the general formula H2NCHRCOOH, where R is an organic substituent.

    WN.com - Articles related to Plants give up some deep secrets of drought resistance 2010

  • These molecules are particularly important in biochemistry, where this term refers to alpha-amino acids with the general formula H2NCHRCOOH, where R is an organic substituent.

    WN.com - Articles related to Plants give up some deep secrets of drought resistance 2010

  • All alcohols carry a hydroxyl substituent (- OH), so they too have oxygen atoms in them.

    Yahoo! Answers: Latest Questions 2010

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