acorn tube

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noun Electronics.

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

QUIZ

TAKE JOY IN ACING THIS QUIZ ON “PRIDE” SYNONYMS

Hold your head up high as you embark on this quiz that explores some of the synonyms and meanings of “pride.”

Question 1 of 7

What does "dignity" mean?

Origin of acorn tube

First recorded in 1930–35

With the help of mobility aids and a feeding tube, she lived well past her initial prognosis of death by age 4.
U.K. Courts Grant Mother Right to End Her 12-Year-Old Disabled Daughter’s Life|Elizabeth Picciuto|November 4, 2014|DAILY BEAST
That incident was due to an “equipment” problem (a steel tube ruptured)—resulting in explosive vapors being released and ignited.
Oil Tankers Leaking into Seattle’s Water|Bill Conroy|October 13, 2014|DAILY BEAST
For hoodie-clad, Silicon Valley-types, this means more transistors in a dense integrated tube.
How We Compute: Flexible Hardware Required||September 29, 2014|DAILY BEAST
With shorts, a man is expected to wear ankle socks rather than pulled up tube socks.
The Problem With Weird Al’s ‘Word Crimes’ Video|John McWhorter|July 23, 2014|DAILY BEAST

Also, because a tube of lipstick stands in for the “i” in “science.”
Girls Love Science. We Tell Them Not To.|Tauriq Moosa|July 17, 2014|DAILY BEAST
Drone: the largest tube of a bag-pipe, giving forth a dull heavy tone.
Gulliver's Travels|Jonathan Swift
Should the vapor not condense well, the test-tube may be immersed in a glass of cold water.
A Manual of Clinical Diagnosis|James Campbell Todd
For comparison, the gas may be passed through a test-tube containing an equal amount of distilled water.
A Manual of Clinical Diagnosis|James Campbell Todd
At once cover the mouth of the tube with a filter-paper cap moistened with saturated aqueous solution of silver nitrate (1:1).
A Manual of Clinical Diagnosis|James Campbell Todd
The best pipet is a small glass tube which has been drawn out at one end to a tip with rather small opening.
A Manual of Clinical Diagnosis|James Campbell Todd