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Definition of Oxidation-reduction
1. Noun. A reversible chemical reaction in which one reaction is an oxidation and the reverse is a reduction.
Medical Definition of Oxidation-reduction
1. A chemical reaction in which an electron is transferred from one molecule to another. The electron-donating molecule is the reducing agent or reductant; the electron-accepting molecule is the oxidizing agent or oxidant. Reducing and oxidizing agents function as conjugate reductant-oxidant pairs or redox pairs. (12 Dec 1998)