isomer /īˈsō-mər/ (chem)

1. A substance, radical, or ion isomeric with another
2. An atomic nucleus having the same atomic number and mass as another or others but a different energy state

iˈsomēre noun (zoology)

An organ or segment corresponding to or homologous with another

isomeric /-merˈik/ adjective (chem)

1. Identical in percentage composition and molecular weight but different in constitution or structure
2. (of nuclei) differing only in energy state and half-life

isomˈerism noun

1. The property of being isomeric
2. The existence of isomers

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