A kind of phytoclast consisting of micrometre-scale tubes with a banded internal ornamentation, known from terrestrial/freshwater settings from the early Silurian onwards.

(electronics, becoming dated) In a television set, before the development of LED screens, the cathode ray tube which produced moving images on its surface.

(electronics) A type of vacuum tube that detects electromagnetic radiation in the range from ultraviolet to infrared, including the visible spectrum, and them amplifies the detection induced current into an output signal

plural of tube well

(video games, slang) A very overpowered firearm, especially a grenade launcher.

Synonym of steerer tube

(cycling) The part of the fork that is inserted into the head tube of the frame, and is used to attach the fork to the frame using a headset.

(cycling) The part of a tubular bicycle's frame in which the front fork steerer tube is mounted.

A natural conduit formed by flowing lava that moves beneath the hardened surface of a lava flow.

(aviation, historical) A speaking tube used for communication between the seats of early open-air aircraft.