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2 definitions found

From: DICT.TW English-Chinese Medical Dictionary 英漢醫學字典

 free radical 名詞
 自由基,游離基

From: WordNet (r) 2.0

 free radical
      n : an atom or group of atoms with at least one unpaired
          electron; in the body it is usually an oxygen molecule
          than 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: radical]