WordNet (r) 3.0 (2006):

central processor
    n 1: (computer science) the part of a computer (a microprocessor
         chip) that does most of the data processing; "the CPU and
         the memory form the central part of a computer to which the
         peripherals are attached" [syn: central processing unit,
         CPU, C.P.U., central processor, processor,
         mainframe]