A person who advocates thorough or complete political or social reform; a member of a political party or part of a party pursuing such aims
A radical formed by the removal of hydrogen ions from an acid
An uncharged molecule (typically highly reactive and short-lived) having an unpaired valency electron
A member of a group of early 19th-cent. radicals whose advocacy of political reform was based on Benthamite utilitarian philosophy.
= philosophical radical.