Isomer

//ˈaɪ.sə.mə// noun

Definitions

Noun
  1. 1
    Any of two or more compounds with the same molecular formula but with different structure. physical
  2. 2
    a compound that exists in forms having different arrangements of atoms but the same molecular weight wordnet
  3. 3
    Any of two or more atomic nuclei with the same mass number and atomic number but with different radioactive properties.

Etymology

From iso- + -mer.

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