I
In politics, one who desires extreme change of part or all of the social order.
The term (which derives from the Latin word for "root," and thus implies change beginning at a system's roots) was given this sense by Marxism ) who called for fundamental social change to eradicate divisions among social classes. In popular usage, it is applied to political extremism, not necessarily violent, of both the left and the right.
II
Term used in chemistry with one predominant and two subsidiary, looser meanings.
It most often refers to a free radical . It can also mean an ion or a functional group .
III
[c mediumvioletred] (as used in expressions)
free radical
Radical Republican
{{link=Radical Socialist Party">Radical Socialist Party