En-thü’sĭ-ăst, n.

(en-thü’/zĭ-ăst), n. [Fr. enthousiaste, Gr. ἐνθουσιάστης, from ἐνθουσιάζειν.] One who is moved or actuated by enthusiasm; as, (a.) One who imagines himself divinely inspired and possessed; a religious madman; a fanatic. (b.) One whose mind is wholly possessed and heated by what engages it; one whose emotions and sensibilities are predominant; an ardent and imaginative person; a zealot.

Enthusiasts soon understand each other. W. Irving.

Synonyms—Visionary; fanatic; devotee.