zealot
noun /ˈzelət/
  /ˈzelət/
 (often disapproving)- a person who is extremely enthusiastic about something, especially religion or politics(尤指宗教或政治的)狂热分子,狂热者 词源mid 16th cent. (in the sense ‘member of an ancient Jewish sect’): via ecclesiastical Latin from Greek zēlōtēs, from zēloun ‘be jealous’, from zēlos.