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English word fanatic comes from Proto-Indo-European *dʰéh₁s, and later Proto-Italic *faznom (Temple.)
*dʰéh₁s (Proto-Indo-European)
*dʰh₁snóm (Proto-Indo-European)
*faznom (Proto-Italic)
Temple.
fanum (Latin)
Shrine, temple, sanctuary, place dedicated to a deity.
fanaticus (Latin)
Of or pertaining to a temple.. Divinely inspired, enthusiastic.. Frantic, frenzied. Furious, mad.
fanatic (English)
A person who is zealously enthusiastic for some cause, especially in religion. (obsolete) Showing evidence of possession by a god or demon; frenzied, overzealous.. Fanatical.