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acorn tube

noun, Electronics.
1.
a vacuum tube, resembling an acorn in size and shape, used chiefly in ultrahigh-frequency electronic devices.
Origin
1930-1935
1930-35
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for acorn tube

acorn valve

noun
1.
a small electronic valve, approximately acorn-shaped with small closely-spaced electrodes, used in ultrahigh-frequency applications
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Difficulty index for acorn tube

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Word Value for acorn

7
9
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