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Noun: fanatic  fu'na-tik
  1. A person with an extreme and uncritical enthusiasm or zeal, especially in religious or political matters
    "Religious fanatics sometimes resort to violence to defend their beliefs"
     
  2. A person obsessively devoted to a particular interest or activity
    "He was a fitness fanatic who spent hours at the gym every day";
    - fiend [informal]
Adjective: fanatic  fu'na-tik
  1. Marked by excessive enthusiasm for and intense devotion to a cause or idea
    "The fanatic supporters refused to leave the stadium after the game";
    - fanatical, overzealous, rabid

Derived forms: fanatics

See also: passionate

Type of: enthusiast, partisan, partizan [rare]

Encyclopedia: Fanatic