1. <chemistry> One of two or more molecules that have the same chemical formula but have a different stereochemical arrangement of their atoms.

2. <radiobiology> Nuclides having the same number of neutrons and protons but capable of existing, for a measurable time, in different quantum states with different energies and radioactive properties. Commonly, the isomer of higher energy decays to one of lower energy by the process of isomeric transition.

(13 Nov 1997)

isomaltase, isomaltose, isomaltulose synthase, isomastigote < Prev | Next > isomerase, isomerases, isomeric

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