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Definition of radical noun from the Oxford Advanced Learner's Dictionary

radical

noun
 
/ˈrædɪkl/
 
/ˈrædɪkl/
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  1. a person with radical opinions
    • political radicals
    Topics Politicsc1
  2. (chemistry) a group of atoms that behave as a single unit in a number of compounds see also free radical
    3. Word Originlate Middle English (in the senses ‘forming the root’ and ‘inherent’): from late Latin radicalis, from Latin radix, radic- ‘root’.
See radical in the Oxford Advanced American DictionarySee radical in the Oxford Learner's Dictionary of Academic English
Check pronunciation: radical

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