accelerator
/əkˈseləreɪtə(r); ək`sɛləˌretɚ/ n
1 device for increasing speed, esp the pedal in a car, etc that controls the speed of the engine 加速器; 加速装置（尤指汽车等的油门踏板）. =>illus at App 1 见附录1之插图, page xii.
2 (physics 物) apparatus for causing charged particles to move at high speeds 粒子加速器.
3 (chemistry 化) substance that causes a chemical reaction to happen more quickly 加速剂; 促进剂.