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free radical is a noun meaning "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". It carries one recorded sense.
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”
Definitions, synonyms and semantic relations for free radical come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.