Third person singular or plural form of baptise (British spelling); to perform the Christian sacrament of baptism on someone.
British English spelling of 'baptizes,' from Latin 'baptizāre' and Greek 'baptizein' (to dip or submerge in water).
The British 's' spelling versus American 'z' spelling is a holdover from how British English preserved older Latin-derived pronunciations differently than American English.
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