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1. (n.) free radical
a molecular fragment that bears one or more unpaired electrons and is therefore highly reactive.
Etymology: (1895–1900)
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| Definition of 'free radical' |
Princeton's WordNet |
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1. (noun) free radical, radical
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"
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Definitions of free radical 
