1. a device that reduces waste and increases efficiency, especially one that recovers heat from exhaust gases in a boiler or heating system
Usage: technical; engineering
2. a person who practices economy or saves money carefully

Examples

• The factory installed an economizer to capture waste heat from the furnace.
• The new boiler system includes an economizer that reduces fuel consumption by 15%.
• As an economizer, she always looks for the best deals before making purchases.
• The ship’s economizer helped reduce coal consumption during the voyage.
• My grandmother was a natural economizer who never wasted anything.
• The economizer in the power plant recovers heat from flue gases.