A person who is really into wine and who really loves talking about wine is an example of a wine enthusiast.
A baseball enthusiast.
- A religious fanatic or zealot.
- An ardent supporter.
Origin of enthusiast
- Greek enthousiastēs possessed person from enthousiazein to be inspired enthusiasm
From American Heritage Dictionary of the English Language, 5th Edition
- From ecclesiastical Greek ἐνθουσιαστής (enthousiastēs, “an enthusiast, a zealot”), from ἐνθουσιάζειν (enthousiazein, “intransitive be inspired or possessed by a god, be rapt, be in ecstasy, transitive inspire”): see enthusiasm.