isomeric i`so*mer"ic ([imac]`s[-o]*m[e^]r"[i^]k), a. [Iso- + Gr. me`ros part: cf. F. isom['e]rique.] (Chem.) Having the same chemical composition and molecular weight; having the same number of atoms of each kind in the molecule; -- said of chemical compounds with known chemical composition. This property used to be called {metameric} to distinguish it from other forms of isomerism. [PJC]

Note: Formerly the term isomeric applied also to comopounds having the same percentage chemical composition, even if the number of atoms in a molecule differed. In the 1913 dictionary isomeric was defined as: ``Having the same percentage composition; -- said of two or more different substances which contain the same ingredients in the same proportions by weight, often used with with. Specif.: (a) Polymeric; i. e., having the same elements united in the same proportion by weight, but with different molecular weights; as, acetylene and benzine are isomeric (polymeric) with each other in this sense. See {Polymeric}. (b) Metameric; i. e., having the same elements united in the same proportions by weight, and with the same molecular weight, but with a different structure or arrangement of the ultimate parts; as, ethyl alcohol and methyl ether are isomeric (metameric) with each other in this sense. See {Metameric}.'' [1913 Webster]

The Collaborative International Dictionary of English. 2000.

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  • Metameric — Met a*mer ic, a. [Pref. meta + Gr. ? part.] 1. (Chem.) Having the same molecular formula, but possessing a different bonding structure and different properties; as, methyl ether and ethyl alcohol are metameric compounds. See {Isomeric}. [1913… …   The Collaborative International Dictionary of English

  • metameric — metaméric adj. m., pl. metamérici; f. sg. metamérică, pl. metamérice Trimis de siveco, 10.08.2004. Sursa: Dicţionar ortografic …   Dicționar Român

  • metameric — [met΄ə mer′ik] adj. 1. Chem. of or exhibiting metamerism 2. Zool. of or formed of metameres; segmented metamerically adv …   English World dictionary

  • metameric — 1. Relating to or showing metamerism, or occurring in a metamere. 2. Referring to a metamer. * * * meta·mer·ic .met ə mer ik adj 1) relating to or exhibiting chemical metamerism: ISOMERIC 2 a) of, relating to, or exhibiting bodily metamerism… …   Medical dictionary

  • metameric — metÉ™ merɪk adj. of or pertaining to metamerism (Chemistry); having a segmented body, dividing into metameres, existing in a metameric state (Zoology) …   English contemporary dictionary

  • metameric — adjective see metamere …   New Collegiate Dictionary

  • metameric — sac see osmeterium …   Dictionary of invertebrate zoology

  • metameric — Chem: having two or more constitutional isomers. Biol: having a segmented body form (metamerism) …   Dictionary of molecular biology

  • metameric — metamerically, adv. /met euh mer ik/, adj. 1. Also, metameral /meuh tam euhr euhl/. Zool. a. consisting of metameres. b. pertaining to metamerism. 2. Chem. of, pertaining to, or characteristic of metamerism. [1840 50; METAMERE + IC] * * * …   Universalium

  • metameric — adjective exhibiting metamerism …   Wiktionary

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