|a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.|
|the offspring of a zebra and a donkey.|
|1.||a device for increasing speed, esp a pedal for controlling the fuel intake in a motor vehicle; throttle|
|2.||physics Also called (not in technical usage): atom smasher a machine for increasing the kinetic energy of subatomic particles or atomic nuclei and focusing them on a target|
|3.||chem a substance that increases the speed of a chemical reaction, esp one that increases the rate of vulcanization of rubber, the rate of development in photography, the rate of setting of synthetic resins, or the rate of setting of concrete; catalyst|
|4.||economics (in an economy) the relationship between the rate of change in output or sales and the consequent change in the level of investment|
|5.||anatomy a muscle or nerve that increases the rate of a function|
accelerator ac·cel·er·a·tor (āk-sěl'ə-rā'tər)
One that increases rapidity of action or function.
A nerve, muscle, or substance that quickens movement or response.
in the rubber industry, any of numerous chemical substances that cause vulcanization (q.v.) of rubber to occur more rapidly or at lower temperatures. Many classes of compounds act as accelerators, the most important being organic materials containing sulfur and nitrogen, especially derivatives of benzothiazole.
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