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    radical

    1. (chem.) A group of atoms, either in a compound or existing alone.

         • PHYSICAL CHEMISTRY


    2. (math.) The root of a number or quantity. The radical sign is √, or more generally n√. It seems to have been first used in 1525 by Christoff Rudolff (1499-1545) in his Die Coss.

         • MATHEMATICS


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