radical

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1. 1(chemistry) two or more atoms bound together as a single unit and forming part of a molecule
2. 2an 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
3. 3a person who has radical ideas or opinions

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• in the body free radicals are high-energy particles that ricochet wildly and damage cells

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