WordWeb Online

1. A person or animal that is markedly unusual or deformed
   - monster, monstrosity, lusus naturae
    
2. Someone who is so ardently devoted to something that it resembles an addiction
   "a bodybuilding freak";
   - addict, nut [informal], junkie [informal], junky [informal]

1. Lose one's nerve
   "When he saw the accident, he freaked out";
   - freak out [informal], gross out [informal]

Derived forms: freaks, freaked, freaking

Type of: enthusiast, mutant, mutation, panic, partisan, partizan, sport, variation

Encyclopedia: Freak, Charles