gas tube

American  

noun

1. an electron tube the envelope of which contains a highly rarefied gas.

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Etymology

Origin of gas tube

First recorded in 1805–15

Example Sentences

The upper receiver contains the firing bolt, barrel and gas tube and is often called the “guts” of the weapon.

From New York Times

By built, I mean I ordered a sealed gas tube with mirrors on both ends and built a high-voltage power supply to fire it.

From Forbes

In May, the company recalled about 95 lanterns for an incorrect gas tube that posed a fire hazard, according to the agency.

From New York Times

On the mantelpiece stands a great bronze six-armed monster, with open mouth, and on a lighted match being secretly applied behind its back to a tiny gas tube within, you turn round to find a long thin flame issuing therefrom, at which the gentlemen light their cigars.

From Project Gutenberg

You can’t see that foregrip now, because it has been turned to charcoal and ash, exposing the barrel and gas tube directly above this rebel’s left index finger.

From New York Times