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Isomeric

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Webster Dictionary
• Isomerism
• Isomeric
• Isomere
Encyclopedias
1911 Encyclopedia Britannica
• Isomerism
• Stereo-Isomerism

(a.) 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 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.