coprocessor

/ (ˌkəʊˈprəʊsɛsə) /

noun

computing a microprocessor circuit that operates alongside and supplements the capabilities of the main processor, providing, for example, high-speed arithmetic

Scientific definitions for coprocessor

coprocessor
[ kōprŏs′ĕs-ər ]

A microprocessor distinct from the central processing unit. A coprocessor performs specialized functions that the central processing unit cannot perform or cannot perform as well and as quickly.