'annealer' originates from English, specifically from the verb 'anneal' (ultimately from Middle English 'anelen' and Old English 'onǣlan'), where the root meant 'to make soft or warm by heating'.

'anneal' changed from the Middle English word 'anelen' (from Old English 'onǣlan') into modern English 'anneal', and the agent noun 'annealer' was formed by adding the suffix '-er' meaning 'one who performs the action'.

Initially, it meant 'to make soft by heating', but over time it evolved into the current technical sense 'to heat and cool materials to remove stress or alter properties'; 'annealer' now denotes the person or device that performs that process.