01 a. Having the same percentage composition; -- said of two or more different substances which contain the same ingredients in the same proporti…
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1.
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.(Chem.)
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2.
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. Also: metameric