radical

adjective

1
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
2
(used of opinions and actions) far beyond the norm
extremist political views
radical opinions on education
3
markedly new or introducing radical change
a revolutionary discovery
radical political views
4
arising from or going to the root or source
a radical flaw in the plan
5
of or relating to or constituting a linguistic root
a radical verb form

1
(linguistics) the form of a word after all affixes are removed
thematic vowels are part of the stem
2
a character conveying the lexical meaning of a logogram
3
a person who has radical ideas or opinions
4
(mathematics) a quantity expressed as the root of another quantity
5
(chemistry) two or more atoms bound together as a single unit and forming part of a molecule
6
an atom or group of atoms with at least one unpaired electron; in the body it is usually an oxygen molecule that 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

Also useful for “radical”:Unscrambler— Rearrange the letters in “radical”