Coprocessor
ahd-5
noun.
A microprocessor that performs specialized functions that the central processing unit cannot perform or cannot perform as well and as quickly.
Wiktionary, Creative Commons Attribution/Share-Alike License
noun.
An additional
microprocessor
used to supplement the functionality of the
central processing unit
, performing tasks such as
floating-point
arithmetic (
floating-point unit
) or
graphics
calculations (graphics processing unit).