| NOUN | substance | free radical, radical | an atom or group of atoms with at least one unpaired electron |
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| 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. | |
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| Example | "in the body free radicals are high-energy particles that ricochet wildly and damage cells" | |
| Synonym | radical | |
| Broader | atom | (physics and chemistry) the smallest component of an element having the chemical properties of the element |
| Spanish | radical libre, radical lliure, radical | |
| Catalan | radical lliure, radical | |
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