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heptode

[hep-tohd] /ˈhɛp toʊd/
noun, Electronics.
1.
a vacuum tube containing seven electrodes, usually a plate, a cathode, a control electrode, and four grids.
Origin of heptode
1930-1935
First recorded in 1930-35; hept- + -ode2
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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