1. One of two or more substances displaying isomerism (q.v.); e.g., l-glucose and d-glucose or citrate and isocitrate. Cf.:stereoisomer. 2. One of two or more nuclides having the same atomic and mass numbers but differing in energy states for a finite period of time; e.g., 99mTc and 99Tc. [iso- + G. meros, part]
- geometric i. geometric isomerism.

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iso·mer 'ī-sə-mər n
1) any of two or more compounds, radicals, or ions that contain the same number of atoms of the same elements but differ in structural arrangement and properties
2) a nuclide isomeric with one or more others

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iso·mer (iґso-mər) [iso- + Gr. meros part] any compound exhibiting, or capable of exhibiting, isomerism. An isomer may be structural or stereochemical; see isomerism.

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  • Isomer — I so*mer ([imac] s[ o]*m[ e]r), n. [See {Isomeric}.] (Chem.) A compound which is isomeric with another body or compound; a compound having the same chemical composition as another compound; a member of an isomeric series. [1913 Webster +PJC] Note …   The Collaborative International Dictionary of English

  • Isomer — Isomēr (grch.), aus gleichen Teilen bestehend. Isomere Körper, in der Chemie Körper von gleicher prozentischer Zusammensetzung, aber verschiedenen Eigenschaften; die Isomeriē kann sich nur auf äußerliche Eigenschaften beziehen (physik. Isomerie) …   Kleines Konversations-Lexikon

  • isomer — ISOMÉR, Ă adj., s.m. v. izomer. Trimis de LauraGellner, 13.09.2007. Sursa: DN …   Dicționar Român

  • isomer — 1866, back formation from isomeric (1838), patterned on Ger. isometrisch, coined by Berzelius (1830) from Gk. isomeres sharing equality, from iso (see ISO (Cf. iso )) + meros part, share (see MERIT (Cf. merit) (n.)) …   Etymology dictionary

  • isomer — ► NOUN 1) Chemistry each of two or more compounds with the same formula but a different arrangement of atoms and different properties. 2) Physics each of two or more atomic nuclei with the same atomic number and mass number but different energy… …   English terms dictionary

  • isomer — [ī′sə mər] n. [< Gr isomerēs, equally divided < isos, equal + meros, a part: see MERIT] 1. Chem. any of two or more chemical compounds having the same constituent elements in the same proportion by weight but differing in physical or… …   English World dictionary

  • Isomer — This article is about the chemical concept. For isomerism of atomic nuclei, see nuclear isomer. In chemistry, isomers (from Greek ἰσομερής, isomerès; isos = equal , méros = part ) are compounds with the same molecular formula but different… …   Wikipedia

  • Isomer — Isomere (Einzahl das Isomer, Genitiv: des Isomers, Genitiv Plural: der Isomere; von griechisch ἴσος ísos „gleich“ und μέρος méros „Teil“) sind chemische Verbindungen, die die gleiche Summenformel besitzen, sich aber in der Verknüpfung und der… …   Deutsch Wikipedia

  • isomer — noun /ˈaɪ.sə.mə,ˈaɪ.sə.mɚ/ a) Any of two or more compounds with the same molecular formula but with different structure. b) Any of two or more atomic nuclei with the same mass number and atomic number but with different radioactive properties.… …   Wiktionary

  • isomer — /uy seuh meuhr/, n. 1. Chem. a compound displaying isomerism with one or more other compounds. 2. Also called nuclear isomer. Physics. a nuclide that exhibits isomerism with one or more other nuclides. [1865 70; back formation from ISOMERIC] * *… …   Universalium

  • isomer — iso|mer 〈Adj.〉 Isomerie aufweisend [<grch. isos „gleich“ + meros „Teil“] * * * I|so|mer [↑ iso (2) u. ↑ mer], das; s, e, auch I|so|me|re, das; n, n: 1) in der Chemie Sammelbez. haupts. für org. Verb. u. Koordinationsverb., die zwar gleiche… …   Universal-Lexikon

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