The definition of a transistor is an electronic device that works by controlling the flow of the electrical current.(noun)
An example of a transistor is something combined in large numbers with microcircuits into a single circuit board and used in a computer.
See transistor in Webster's New World College Dictionary
Origin: tran(sfer) + (re)sistor: it transfers a current across a resistor
See transistor in American Heritage Dictionary 4
Origin: + (res)istor.
Learn more about transistor