1. • noun - (chemistry) two or more atoms bound together as a single unit and forming part of a molecule
   • noun - an atom or group of atoms with at least one unpaired electron
   • noun - a person who has radical ideas or opinions
   • noun - (mathematics) a quantity expressed as the root of another quantity
   • noun - a character conveying the lexical meaning of a logogram
   • noun - (linguistics) the form of a word after all affixes are removed
   • adj - (used of opinions and actions) far beyond the norm
   • adj - markedly new or introducing radical change
   • adj - arising from or going to the root or source
   • adj - of or relating to or constituting a linguistic root
   • adj - especially of leaves
2. • Arising from or going to a root or source; basic: a radical flaw in a plan; chose the radical solution of starting all over again.
   • Departing markedly from the usual or customary; extreme: radical opinions on education.
   • Favoring or effecting fundamental or revolutionary changes in current practices, conditions, or institutions: radical political views.
   • Linguistics.
   • Arising from the root or its crown: radical leaves.
   • One who advocates fundamental or revolutionary changes in current practices, conditions, or institutions: radicals seeking to overthrow the social order.
   • The root of a quantity as indicated by the radical sign.
   • R An atom or a group of atoms with at least one unpaired electron.
   • See root1 (n.
3. • n - a group of atoms that acts as a unit in chemical compounds

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