Definitions for "RADICALS"
atoms or polyatomic molecules with at least one unpaired electron.
free highly reactive molecules containing at least one unpaired electron
(Free Radicals) A molecule which has at least one unpaired electron. In polymers, such a species will be formed, most probably, as a result of chemical bond breakage by heat or light energy. These free radicals are very active, and in their attempt to pair their lone electron, are capable of breaking other chemical bonds. Thus, they can cause degradation in a polymer.
The Radicals were a parliamentary political grouping in the United Kingdom in the early to mid 19th century, who helped to transform the Whigs into the Liberal Party.