Radical

rad′i-kal, adj. pertaining to the root or origin: original: fundamental: intrinsic: primitive: implanted by nature: not derived: serving to originate: ( bot. ) proceeding immediately from the root: ( politics ) ultra-liberal, democratic.— n. a root: a primitive word or letter: one who advocates radical reform, an uncompromising democratic politician: ( chem. ) the base of a compound.— v.t. Rad′icalise , to make radical.— v.i. to become radical, adopt radical political principles.— n. Rad′icalism , the principles or spirit of a radical or democrat.— adv. Rad′ically .— n. Rad′icalne . [ Radix. ]