optical isomerism
Isomerism I*som"er*ism, n. (Chem.) The state, quality, or relation, of two or more isomeric substances. [1913 Webster]

{Physical isomerism} (Chem.), a former term for {optical isomerism}.

{optical isomerism} (Chem.), the condition or relation of certain (isomeric) substances, which, while chemically identical (in that they have the same composition, the same molecular weights, and the same ultimate constitution), are yet physically different, as in their action on polarized light, as dextro- and l[ae]vo-tartaric acids, or the sugars galactose and glucose. In such compounds there is usually at least one unsymmetrical carbon atom and typically more than one. See {Unsymmetrical}. [1913 Webster +PJC]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • optical isomerism — n. a type of isomerism in which isomeric compounds differ only in the direction in which they rotate the plane of polarized light …   English World dictionary

  • optical isomerism — n stereoisomerism in which the isomers have different effects on polarized light and in which asymmetry of the molecule as a whole or the presence of one or more asymmetrical atoms is responsible for such effects * * * an old division of… …   Medical dictionary

  • optical isomerism — optinė izomerija statusas T sritis chemija apibrėžtis Dviejų erdvinių izomerų, skirtingai sukančių šviesos poliarizacijos plokštumą, buvimas. atitikmenys: angl. optical isomerism rus. оптическая изомерия …   Chemijos terminų aiškinamasis žodynas

  • optical isomerism — optinė izomerija statusas T sritis fizika atitikmenys: angl. optical isomerism vok. optische Isomerie, f rus. оптическая изомерия, f pranc. isomérie optique, f …   Fizikos terminų žodynas

  • optical isomerism — /ɒptɪkəl aɪˈsɒmərɪzəm/ (say optikuhl uy somuhrizuhm) noun a form of isomerism in which the isomers are mirror images, and have equal and opposite optical activity …   Australian English dictionary

  • optical isomerism — noun : stereoisomerism in which the isomers have different effects on polarized light and in which asymmetry of the molecule as a whole or the presence of one or more asymmetric atoms is held to be responsible for such effects compare asymmetric… …   Useful english dictionary

  • optical isomerism — Compounds that are mirror images and differ in turning the plane of polarized light left (L form) or right (D form) …   Dictionary of invertebrate zoology

  • optical isomerism — Chem. stereoisomerism in which the isomers are identical in molecular weight and most chemical and physical properties but differ in their effect on the rotation of polarized light. Cf. dextrorotatory, levorotatory, racemism. [1890 95] * * * …   Universalium

  • Isomerism — I*som er*ism, n. (Chem.) The state, quality, or relation, of two or more isomeric substances. [1913 Webster] {Physical isomerism} (Chem.), a former term for {optical isomerism}. {optical isomerism} (Chem.), the condition or relation of certain… …   The Collaborative International Dictionary of English

  • optical isomer — n one of two or more forms of a compound exhibiting optical isomerism …   Medical dictionary

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