adj.
1.(used of opinions and actions) far beyond the norm
2.markedly new or introducing radical change
3.arising from or going to the root
4.of or relating to or constituting a linguistic root
5.especially of leaves radical n.
1.(chemistry) two or more atoms bound together as a single unit and forming part of a molecule
2.an atom or group of atoms with at least one unpaired electron
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
6.(linguistics) the form of a word after all affixes are removed
