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Pronunciation: i'so-mer


  1. One of two or more substances displaying isomerism, l-glucose and d-glucose or citrate and isocitrate.
  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, 99mTc and 99Tc.

[iso- + G. meros, part]

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.