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1 definition found
 for free radical
From WordNet (r) 3.0 (2006) :

  free radical
      n 1: 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" [syn: free radical, radical]

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