<electronics> (FET) A transistor with a region of donor
material with two terminals called the "source" and the
"drain", and an adjoining region of acceptor material
between, called the "gate". The voltage between the gate and
the substrate controls the current flow between source and
drain by depleting the donor region of its charge carriers to
greater or lesser extent.
There are two kinds of FET's, Junction FETs and MOSFETs.
Because no current (except a minute leakage current) flows
through the gate, FETs can be used to make circuits with very
low power consumption.
Contrast bipolar transistor.
(1995-10-05)
Field-effecttransistor
TRANSISTOR THAT USES AN ELECTRIC FIELD TO CONTROL ITS ELECTRICAL BEHAVIOUR
The field-effecttransistor (FET) is a type of transistor that uses an electric field to control the flow of current in a semiconductor. FETs (JFETs or MOSFETs) are devices with three terminals: source, gate, and drain.
¦ noun Electronics a transistor in which most current is carried along a channel whose effective resistance can be controlled by a transverse electric field.
Wikipedia
MESFET
A MESFET (metal–semiconductor field-effect transistor) is a field-effect transistor semiconductor device similar to a JFET with a Schottky (metal–semiconductor) junction instead of a p–n junction for a gate.