piston
pi stuhn
- n United States neoclassical composer (1894-1976)
- n mechanical device that has a plunging or thrusting motion
- Unlike the pistons in ordinary engines, those in Karol's engine are double-ended and have entirely separate functions (see diagram).
- Conventional gasoline engines have a basic fault; their reciprocating parts (pistons, connecting rods, etc.
- Smaller free piston engines are under development by General Motors for passenger cars and trucks.