accelerator /ak'sebreita(r); aek'sclaetv/ n 1 device, eg the pedal in a car, for controlling speed. 加速裝置 (例如汽車等中之油門踏板); 加速器。→ the illus at motor. 參看 motor 之插圖。 2 (phys) device for accelerating particles or nuclei, also called (colloq) an atom-smasher. (物理) 加速器 (俗稱'核粒子加速器) 。