Main Entry: ac·cel·er·a·tor

Pronunciation: \ik-ˈsel-ə-ˌrāt-ər, ak-\

Function: noun

: one that accelerates: as a : a muscle or nerve that speeds the performance of an action <a cardiac accelerator> b : a substance that speeds a chemical reaction c : an apparatus for imparting high velocities to charged particles (as electrons)