'economizer' originates from English, formed from the verb 'economize' plus the agent suffix '-er' (meaning 'one who economizes' or 'device that economizes').

'economizer' developed from Middle English/Modern English forms of 'economize,' which came via French 'économiser' from Late Latin 'oeconomicus' and ultimately from Greek 'oikonomos' (household manager); the modern English noun was formed by adding '-er' to the verb.

Initially related to 'managing a household' or 'household economy,' the term evolved to mean 'manage or save resources' and later to denote devices that improve efficiency by saving energy or resources.