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Radical 'related to roots', may refer to:

In chemistry:

  • A radical (chemistry) is an atom, molecule, or ion with unpaired valence electron(s), that is likely to take part in chemical reactions

In mathematics:

In medicine:

  • Radical surgery, surgery carried out in which diseased tissue or lymph nodes are removed from a diseased organ

In linguistics:

  • In an inflected language such as English or Spanish, the radical verbs (also called 'radical-changing') are exceptions to the standard patterns of word change (e.g., to be is in most Indo European languages).
  • Root (linguistics), also called a "radical", the form of a word after any prefixes and suffixes are removed
  • Radical (Chinese character), part of a Chinese character under which it is indexed in a dictionary (also called bùshǒu 部首)
  • Radical, one of the three consonants in a Semitic root
  • Radical consonant, a consonant articulated with the root of the tongue

In politics:

In religion:

In books:

In culture:

  • Radical feminism, a current within feminism that focuses on patriarchy as a system of power
  • Radical veganism, a radical interpretation of veganism, usually combined with anarchism
  • Radical chic, a term coined by Tom Wolfe to describe the pretentious adoption of radical causes by celebrities, socialites, and high society

In architecture:

  • Radical Baroque, an architectural style characterized by the curvature of walls and intersection of oval spaces

In entertainment:

Brands, titles and proper names: