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A battery

noun

, Electronics.
  1. an electric battery for heating the filament or cathode heater of an electron tube.

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Word History and Origins

Origin of A battery1

First recorded in 1920–25

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Example Sentences

To do so connect the grid as in Fig. 115 to the positive terminal of the A-battery.

We shall call the battery which heats the filament the “filament battery” or sometimes the “A-battery.”

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