1. a small electronic device that controls the flow of electric current and is used to amplify signals or switch electronic circuits on and off

Examples

• The transistor revolutionized electronics in the 1950s.
• Modern computer processors contain billions of tiny transistors.
• She replaced the faulty transistor in the radio circuit.
• The invention of the transistor made portable radios possible.
• Each transistor can act as either an amplifier or a switch.
• The engineer tested the transistor’s ability to control current flow.