accumulator: (computer science) a register that has a built-in adder that adds an input number to the contents of the register
register: (computer science) memory device that is the part of computer memory that has a specific address and that is used to hold information of a specific kind
poundal: a unit of force equal to the force that imparts an acceleration of 1 foot/sec/sec to a mass of 1 pound; equal to 0.1382 newtons