From Longman Business Dictionary
microprocessormi·cro·pro·ces·sor /ˈmaɪkrəʊˌprəʊsesə-kroʊˌprɑː- sesər/ noun [countableC]COMPUTING the central CHIP in a computer, which controls most of its operationsThe development of increasingly powerful and inexpensive microprocessors led to the widespread use of personal computers.