isomeric definition

<chemistry> 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., 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. Metameric; i. E, having the same elements united in the same proportions by weight, and with the same molecular weight, but which 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.

Origin: Iso- + Gr. Part: cf. F. Isomerique.

(01 Mar 1998)