Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- n. An atom, radical, or group substituted for another in a chemical compound.
- adj. Of or relating to such an atom or group.
Century Dictionary and Cyclopedia
- n. 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.
Wiktionary
- n. chemistry any atom, group, or radical substituted for another, or entering a molecule in place of some other part which is removed
GNU Webster's 1913
- n. (Chem.) Any atom, group, or radical substituted for another, or entering a molecule in place of some other part which is removed.
Etymologies
- Latin substituēns, substituent-, present participle of substituere, to substitute; see substitute. (American Heritage® Dictionary of the English Language, Fourth Edition)
Examples
“Would the substituent fractions all have faced the same exact problems?”
“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.”
“Deci, această secţiune este prezentat aici ca un substituent, un monument mici pentru a optimismul meu.”
“My first scientific paper in 1961 reported an additivity rule for substituent induced shifts of proton NMR signals in steroid derivatives.”
“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.”
“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.”
“All alcohols carry a hydroxyl substituent (- OH), so they too have oxygen atoms in them.”
“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.”
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“The record, however, shows no discernible reason for a skilled artisan to begin with lansoprazole only to drop the very feature, the fluorinated substituent, that gave this advantageous property.”
“In particular, the court noted that it would not make sense to drop trifluroethoxy from the prior art - since it is that substituent that activated Lansoprazole.”
Lists
These user-created lists contain the word ‘substituent’.
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Logolepsy
"Luciferous Logolepsy is a collection of over 9,000 obscure English words. Though the definition of an 'English' word might seem to be straightforward, it is not. There exist so many adopted, deriv...
Anschauung, Areopagus, Argus, Briarean, Dei gratia, Dei judicium, Deo volente, Duecento, Foehn, Geflugelte Worte, Gegenschein, Hakenkreuz and 9230 more...
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Adjectival Arcana
A roster of adjectives that infrequently surface in typical conversation and writing. Many are dredged from scientific or other technical jargon or sieved from examples of disused archaic forms.
unitegmic, acaulescent, reticuloendothelial, ingressive, uniate, acanthopterygian, ossific, epiphysial, perivisceral, acœlomatous, cestoid, acælomate and 7756 more...
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