radical

Adjective

• 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
  • basal placentation
    
  • radical leaves
    

• of or relating to or constituting a linguistic root
  • a radical verb form
    

• arising from or going to the root or source
  • a radical flaw in the plan
    

• markedly new or introducing radical change
  • a revolutionary discovery
    
  • radical political views
    

• (used of opinions and actions) far beyond the norm
  • extremist political views
    
  • radical opinions on education
    
  • an ultra conservative
    

Noun

• (linguistics) the form of a word after all affixes are removed
  • thematic vowels are part of the stem
    

• a character conveying the lexical meaning of a logogram

• (mathematics) a quantity expressed as the root of another quantity

• a person who has radical ideas or opinions

• 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
    

• (chemistry) two or more atoms bound together as a single unit and forming part of a molecule

Related words

• Synonyms: 
  basal , revolutionary , extremist , ultra , root , root word , base , stem , theme , free radical , group , chemical group