Pronunciation: (tran-zis'tur),[key] —n. 1. Electronics.a semiconductor device that amplifies, oscillates, or switches the flow of current between two terminals by varying the current or voltage between one of the terminals and a third: although much smaller in size than a vacuum tube, it performs similar functions without requiring current to heat a cathode.
2. Informal.a transistorized radio.
—adj. Informal.transistorized: a transistor radio.