Accelerator n. : One who, or that which, accelerates. Also as an adj.; as, accelerator nerves.

Example:
What is the fastest download Accelerator?

Taxonomy
Accelerator, speeds, projectile, free encyclopedia, high speeds, science and technology, weapon, combustion, band, physics and chemistry, download, graphics processing unit, graphics accelerator, library, software applications, particle accelerator, search, free dictionary.

Defination from the web:
accelerator, a dedicated graphics rendering device ... Cement accelerator, an admixture that speeds the cure time of concrete. Particle accelerator, a device which uses electric and/or magnetic fields to propel charged particles to high speeds ...