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Isomerous

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Isomerous --> isomeric

(Science: 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.