RISC 
reduced instruction set computer 
A microprocessor chip design that dramatically reduces the number of instructions a chip performs. These reduced instruction set processors are faster than earlier chips and are less expensive to manufacture. In addition, the chip's increased speeds make them ideal for everything from running multimedia applications to use in PDAs. Motorola's PowerPC chip, which is commonly used in Macintosh computers, is an RISC chip, as are Pentium processors.