[ahy-suh-mer] /ˈaɪ sə mər/

Chemistry. a compound displaying isomerism with one or more other compounds.
Also called nuclear isomer. Physics. a nuclide that exhibits isomerism with one or more other nuclides.
(chem) a compound that exhibits isomerism with one or more other compounds
(physics) a nuclide that exhibits isomerism with one or more other nuclides

1866, back-formation from isomeric; cf. Greek isomeres “sharing equality,” from iso- (see iso-) + meros “part, share” (see merit (n.)).

isomer i·so·mer (ī’sə-mər)

i’so·mer’ic (-měr’ĭk) adj.
Any of two or more compounds, such as lactose and sucrose, composed of the same elements in the same proportions but differing in structure and other properties. There are two types of isomers, structural isomers and stereoisomers.


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  • Isomerase

    [ahy-som-uh-reys, -reyz] /aɪˈsɒm əˌreɪs, -ˌreɪz/ noun, Biochemistry. 1. any of a class of enzymes that catalyze reactions involving intramolecular rearrangements. /aɪˈsɒməreɪs/ noun 1. any enzyme that catalyses the conversion of one isomeric form of a compound to another isomerase i·som·er·ase (ī-sŏm’ə-rās’) n. One of a group of enzymes that catalyzes the conversion of one isomer […]

  • Isomeric

    [ahy-suh-mer-ik] /ˌaɪ səˈmɛr ɪk/ adjective 1. of, relating to, or displaying .

  • Isomerism

    [ahy-som-uh-riz-uh m] /aɪˈsɒm əˌrɪz əm/ noun 1. Chemistry. the relation of two or more compounds, radicals, or ions that are composed of the same kinds and numbers of atoms but differ from each other in structural arrangement (structural isomerism) as CH 3 OCH 3 and CH 3 CH 2 OH, or in the arrangement of […]

  • Isomerization

    [ahy-som-uh-rahyz] /aɪˈsɒm əˌraɪz/ verb (used with or without object), isomerized, isomerizing. Chemistry. 1. to convert into an . /aɪˈsɒməˌraɪz/ verb 1. (chem) to change or cause to change from one isomer to another isomerization i·som·er·i·za·tion (ī-sŏm’ər-ĭ-zā’shən) n. A process in which one isomer is formed from another. i·som’er·ize’ (-ə-rīz’) v.

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