radical
     adj 1: (used of opinions and actions) far beyond the norm;
            "extremist political views"; "radical opinions on
            education"; "an ultra conservative" [syn: {extremist},
             {ultra}]
     2: markedly new or introducing radical change; "a revolutionary
        discovery"; "radical political views" [syn: {revolutionary}]
     3: arising from or going to the root; "a radical flaw in the
        plan"
     4: of or relating to or constituting a linguistic root; "a
        radical verb form"
     5: especially of leaves; located at the base of a plant or
        stem; especially arising directly from the root or
        rootstock or a root-like stem; "basal placentation";
        "radical leaves" [syn: {basal}] [ant: {cauline}]
     n 1: (chemistry) two or more atoms bound together as a single
          unit and forming part of a molecule [syn: {group}, {chemical
          group}]
     2: an atom or group of atoms with at least one unpaired
        electron; in the body it is usually an oxygen molecule
        than has lost an electron and will stabilize itself by
        stealing an electron from a nearby molecule; "in the body
        free radicals are high-energy particles that ricochet
        wildly and damage cells" [syn: {free radical}]
     3: a person who has radical ideas or opinions
     4: a character conveying the lexical meaning of a logogram
     5: a sign placed in front of an expression to denote that a
        root is to be extracted [syn: {radical sign}]
     6: (linguistics) the form of a word after all affixes are
        removed; "thematic vowels are part of the stem" [syn: {root},
         {root word}, {base}, {stem}, {theme}]
Source: WordNet® 2.0