Isomeric

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  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]

From WordNet (r) 2.0 [wn]:

  isomeric
       adj : of or relating to or exhibiting isomerism