/ək'seləreɪtə(r); ək`sɛlə,retɚ/
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.

n[C]
the part of a car or other vehicle that you press with your foot to make it go faster
American Equivalent: gas pedal
technical a large machine used to make extremely small pieces of matter¹(3) move at extremely high speeds