Source : Webster's Revised Unabridged Dictionary (1913)

Calvinist \Cal"vin*ist\, n. [Cf. F. Calviniste.]
   A follower of Calvin; a believer in Calvinism.

Source : WordNet®

Calvinist
     adj : of or relating to or characteristic of Calvinism or its
           adherents [syn: {Calvinistic}, {Calvinistical}]

Calvinist
     n : an adherent of the theological doctrines of John Calvin