'anointer' originates from Old French, specifically the word 'anoindre', ultimately from Latin roots related to 'unguere' (to smear or anoint). The English agentive suffix '-er' was added to form a noun meaning 'one who anoints.'

'anointer' changed from Middle English forms derived from Old French 'anoindre' (from Latin 'unguere'/'ungere') into the modern English verb 'anoint' and then into the agent noun 'anointer' by the addition of '-er'.

Initially it referred literally to rubbing or smearing with oil (for medicinal or ritual purposes); over time it retained that sense but became more specialized as a ceremonial or religious act — hence a person called an 'anointer' is typically one who consecrates or blesses by applying oil.