Reducer (noun)

1. A device or mechanism used to reduce the size, scale, or power of something.
2. A component or piece of machinery used to decrease the speed of a motor or engine.
3. A substance or chemical used to lower the viscosity of a material.

Origin:

The word 'reducer' is derived from the verb 'reduce', which means 'to make smaller or bring to a lesser degree'. the word has been used in a variety of technical and mechanical contexts to describe devices or mechanisms that are used to reduce size, scale, or power.

Examples:

1. The reducer was used to decrease the diameter of the pipe.
2. The gear reducer was used to slow down the speed of the motor.
3. The oil reducer was added to the paint to make it easier to apply.
4. The reducer was critical in achieving the desired size and scale of the project.
5. The reducer allowed the engine to operate at a lower power and conserve fuel.