Medical Dictionary

radical rad·i·cal (rād'ĭ-kəl)
Abbr. R

  1. A group of elements or atoms usually passing intact from one compound to another but generally incapable of prolonged existence in a free state.

  2. A free radical.

  1. Of or being medical treatment by extreme, drastic, or innovative measures.

  2. Designed to act on or eliminate the root or cause of a pathological process.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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