A reservoir in a continuous-flow oxygen system in which oxygen exhaled by the user is collected for recirculation in the system
A device for making a vehicle use less fuel, either by regulating the flow of fuel, or by admitting extra air to the air/fuel mixture -- especially when cruising
econo·mize economizes economizing economized in BRIT, also use economise If you economize, you save money by spending it very carefully. We're going to have to economize from now on Hollywood has been talking about economizing on movie budgets. to reduce the amount of money, time, goods etc that you use economize on