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heptode

American  
[hep-tohd] / ˈhɛp toʊd /

noun

Electronics.

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

Etymology

Origin of heptode

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

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

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.