Definition of prime-sign in English:

prime-sign

verb

Christian Church
historical
  • with object To mark with the sign of the cross before baptism; to make (a person) a Christian convert or initiate.

Origin

Middle English; earliest use found in Ormulum. Probably from Anglo-Norman primseingner, primsener, primsenier, primsiner, primeseiner and Old French primsener, primseignier to mark (a person) with the sign of the cross before baptism, to make the sign of the cross over (a person); further etymology uncertain.

Pronunciation

prime-sign

/ˈprʌɪmsʌɪn/