field-effect transistor

US: (fēld′i fekt′)

WordReference Random House Unabridged Dictionary of American English © 2026

field′-ef•fect transis′tor  (fēld′i fekt′), [Electronics.]

1. Electronics a transistor in which the output current is varied by varying the value of an electric field within a region of the device. Abbr.: FET

• 1950–55

Collins Concise English Dictionary © HarperCollins Publishers::

field-effect transistor noun

1. a unipolar transistor consisting of three or more electrode regions, the source, one or more gates, and the drain. A current flowing in a channel between the highly doped source and drain is controlled by the electric field arising from a voltage applied between source and gate