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acorn tube

American  

noun

Electronics.

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

Etymology

Origin of acorn tube

First recorded in 1930–35

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.