heptode

American

[hep-tohd] / ˈhɛp toʊd /

noun

Electronics.

a vacuum tube containing seven electrodes, usually a plate, a cathode, a control electrode, and four grids.

First recorded in 1930–35; hept- ( def. ) + -ode ²

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023