tube, in electronics: see electron tube electron tube, device consisting of a sealed enclosure in which electrons flow between electrodes separated either by a vacuum (in a vacuum tube) or by an ionized gas at low pressure (in a gas tube).
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tube

See CRT and vacuum tube.

tube

1. Anatomy

a. short for Eustachian tube, Fallopian tube

b. any hollow cylindrical structure

2. Botany

a. the lower part of a gamopetalous corolla or gamosepalous calyx, below the lobes

b. any other hollow structure in a plant

3. Brit the tube

a. an underground railway system

b. the tunnels through which the railway runs

c. the train itself

d. ™ the London underground railway system

4. Electronics

a. another name for valve

b. See electron tube cathode-ray tube

5. Surfing the cylindrical passage formed when a wave breaks and the crest tips forward

tube [′tüb]

(biology)

A narrow channel within the body of an animal or plant.

(electronics)

electron tube

(engineering)

A long cylindrical body with a hollow center used especially to convey fluid.

inner tube

(geology)

A passage in a cave having smooth sides and an elliptical to nearly circular cross section.

(ordnance)

The main part of a gun, the cylindrical piece of metal surrounding the bore; tube is frequently used in referring to artillery weapons, and barrel is more frequently used in referring to small arms.

1.	(hardware)	tube - A CRT terminal. Never used in the mainstream sense of TV; real hackers don't watch TV, except for Loony Toons, Rocky & Bullwinkle, Trek Classic, the Simpsons, and the occasional cheesy old swashbuckler movie.
2.	(electronics)	tube - electron tube.
3.	(jargon)	tube - (IBM) To send a copy of something to someone else's terminal. "Tube me that note."

tube (redirected from buccal tube)

tube

tube
(redirected from buccal tube)