tetrode

noun Electronics.

1. a vacuum tube containing four electrodes, usually a plate, two grids, and a cathode.

noun

1. an electronic valve having four electrodes, namely a cathode, control grid, screen grid, and anode
2. (modifier) (of a transistor) having two terminals on the base or gate to improve the performance at high frequencies

1. A four-element electron tube containing an anode, cathode, control grid, and additional electrode called the screen. They function in the same manner as triode, but are more effective at higher frequencies due to the effect of the screen. See more at screen. See also pentode.