noun hep·tode \ˈhepˌtōd\

Definition of heptode



  1. :  a vacuum tube with seven electrodes including a cathode, an anode, a control grid, and four additional grids or other electrodes

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Origin and Etymology of heptode

International Scientific Vocabulary hepta- + -ode

Seen and Heard

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a rounded knoll or a ridge of ice

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