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Definition of Free radical
1. Noun. An atom or group of atoms with at least one unpaired electron; in the body it is usually an oxygen molecule that has lost an electron and will stabilize itself by stealing an electron from a nearby molecule. "In the body free radicals are high-energy particles that ricochet wildly and damage cells"
Medical Definition of Free radical
1. A chemically active atom or molecular fragment containing a chemical charge due to an excess or deficient number of electrons. Radicals seek to receive or release electrons in order to achieve a more stable configuration, a process that can damage the large molecules within cells. See: Oxidation. (09 Oct 1997)
Lexicographical Neighbors of Free Radical
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