tetrode

[te-trohd]
noun Electronics.
a vacuum tube containing four electrodes, usually a plate, two grids, and a cathode.

Origin:
1900–05; tetr- + -ode1

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Collins
World English Dictionary
tetrode (ˈtɛtrəʊd)
 
n
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

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American Heritage
Science Dictionary
tetrode   (tět'rōd')  Pronunciation Key 
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

tetrode

vacuum-type electron tube with four electrodes. In addition to the cathode filament, anode plate, and control grid, as in the triode, an additional grid, the screen grid, is placed between the control grid and the anode plate. The screen grid acts as an electrostatic shield to protect the control grid from the influence of the plate when its potential changes. Although the pentode has replaced the tetrode in most vacuum-tube functions, a specially designed tetrode, called the beam-power tube, has found extensive use in power amplification

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The plant continues to utilize the original design of a tetrode driving a super power triode.
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