Definition of Old Christian in English:

Old Christian

Pronunciation /ˌəʊl(d) ˈkrɪstʃ(ə)n/

noun

historical
  • In Spain, and subsequently other (chiefly southern European) countries: a person born into the Christian (especially the Catholic) faith, as opposed to a convert. Compare New Christian .

Origin

Early 17th century; earliest use found in Thomas Shelton (fl. 1598–1629), translator. From old + Christian.