Plain English Meaning
A spinning wheel with curved blades that throws air or liquid outward, raising its pressure and pushing it through the system.
Full Definition
A rotating disk fitted with vanes or blades that accelerates a fluid (air, fuel, or liquid) outward by centrifugal force. In aviation, impellers are most commonly found in centrifugal-flow turbine engines, turbochargers, superchargers, and engine-driven fuel and coolant pumps, where they convert mechanical rotation into increased fluid pressure and flow.
Context Anchor
Seen in aircraft engine, fuel, oil, cooling, turbocharger, supercharger, and pump discussions.