isomer (I´so-mer)

1. One of two or more substances displaying isomerism; e.g., l-glucose and d-glucose or citrate and isocitrate. Cf. stereoisomer. 2. One of two or more nuclides having the same atomic and mass numbers but differing in energy states for a finite period of time; e.g., 99mTc and 99Tc. [iso- + G. meros, part]
geometric i. See geometric isomerism.


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