| Pronunciation: | | free'radikul
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 WordNet Dictionary |
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| | Definition: | | [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" |
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| | Synonyms: | | radical |
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| | See Also: | | atom |
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| Medical Dictionary |
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| | Definition: | | An atom or molecule produced as a by-product of oxidation (the cellular process of burning fuel) that bears an unpaired electron and is potentially harmful to the body. Free radicals are neutralized in the body by antioxidants. |
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| Biology Dictionary |
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| | Definition: | | An atom or or electrically neutral molecule that has one or more unpaired electrons in its outer orbital. Free radicals are unstable and react quickly with other atoms and molecules; because of this, they can cause damage to living tissues. |
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| | Synonyms: | | radical |
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