Radical (from Latin radicis, genitive of radix "root") can refer to many different things and concepts.MathematicsThe symbol used to indicate the nth root of a numberRadical of an algebraic group, a concept in algebraic group theoryRadical of an ideal, an important concept in abstract algebraRadical of an integer, a concept in number theoryRadical of a bilinear form, a concept in linear algebraRadical of a Lie algebra, a concept in Li