Cultural Dictionary

radical definition

In politics, someone who demands substantial or extreme changes in the existing system.

American Heritage
Cultural Dictionary

radical definition

In chemistry, an atom or group of atoms that has at least one electron free to participate in forming a chemical bond.

Note: In general, radicals are associated with chemical reactions that proceed rapidly.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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