1 Relating to, consisting of, or going to the root or fundament; necessitating, entailing, or favouring fundamental social, economic, or political change. n.
2 A group of atoms that is unstable in the free state but when bound together in a molecule behaves as a single unit, such as the acetyl group —COCH3. See also free radical. [From Latin radix a root + − icalis of, relating to, or resembling]
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