Definition of crypto-Calvinist in US English:

crypto-Calvinist

noun

historical
  • In 16th-cent. Germany: a Lutheran who secretly adheres to Calvinist principles; a Philippist, a Melanchthonian. Also more generally: any secret adherent of Calvinism.

Origin

Mid 18th century; earliest use found in Archibald Maclaine (1722–1804), Presbyterian minister and historian. From crypto- + Calvinist, partly after post-classical Latin crypto-Calvinista and German Kryptokalvinist, † Cryptokalvinist.

Pronunciation

crypto-Calvinist

/ˌkrɪptəʊˈkalvɪnɪst/