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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World English Dictionary
acorn valve or (US) acorn tube
 
n
a small electronic valve, approximately acorn-shaped with small closely-spaced electrodes, used in ultrahigh-frequency applications
 
acorn tube or (US) acorn tube
 
n

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