FREE RADICAL
\fɹˈiː ɹˈadɪkə͡l], \fɹˈiː ɹˈadɪkəl], \f_ɹ_ˈiː ɹ_ˈa_d_ɪ_k_əl]\
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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"
By Princeton University
