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heptode

[hep-tohd]
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noun Electronics.
  1. a vacuum tube containing seven electrodes, usually a plate, a cathode, a control electrode, and four grids.
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Origin of heptode

First recorded in 1930–35; hept- + -ode2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018