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1. (used of opinions and actions) far beyond the norm
   "radical opinions on education"
   - extremist, ultra
    
2. Markedly new or introducing radical change
   "radical political views"
   - revolutionary
    
3. Arising from or going to the root or source
   "a radical flaw in the plan"
    
4. Of or relating to or constituting a linguistic root
   "a radical verb form"
    
5. Especially of leaves; located at the base of a plant or stem; especially arising directly from the root or rootstock or a root-like stem
   "radical leaves"
   - basal

1. (chemistry) two or more atoms bound together as a single unit and forming part of a molecule
   - group, chemical group
    
2. An atom or group of atoms with at least one unpaired electron; in the body it is usually an oxygen molecule that has lost an electron and will stabilize itself by stealing an electron from a nearby molecule
   "in the body free radicals are high-energy particles that ricochet wildly and damage cells"
   - free radical
    
3. A person who has radical ideas or opinions
    
4. (mathematics) a quantity expressed as the root of another quantity
    
5. A character conveying the lexical meaning of a logogram
    
6. (linguistics) the form of a word after all affixes are removed
   - root, root word, base, stem, theme

Sounds like: radicle

Derived forms: radicals

See also: basic, immoderate, new, radically

Type of: amount, atom, building block, character, descriptor, form, grapheme, graphic symbol, individual, measure, mortal, person, quantity, signifier, somebody, someone, soul, unit, word form

Antonym: cauline

Part of: ideogram, ideograph, molecule

Encyclopedia: Radical