acorn-tube

acorn tube

noun Electronics.
a vacuum tube, resembling an acorn in size and shape, used chiefly in ultrahigh-frequency electronic devices.

Origin:
1930–35

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
acorn tube

noun
a small vacuum tube; used at high frequencies 
WordNet® 3.0, © 2006 by Princeton University.
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