1. 自由基;游离基
    Free radicals are atoms that contain one or more unpaired electrons. Free radicals are believed to be a cause of ageing, heart disease, and some cancers.

1. 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

    e.g. in the body free radicals are high-energy particles that ricochet wildly and damage cells

    Synonym: radical