a valve that regulates the supply of fuel to the engine | a carpenter's hand tool with an adjustable blade for smoothing or shaping wood |
a scientific instrument that increases the kinetic energy of charged particles | an aircraft that has a fixed wing and is powered by propellers or jets |
a pedal that controls the throttle valve | a power tool for smoothing or shaping wood |
(chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected | (mathematics) an unbounded two-dimensional shape |
| a level of existence or development |