Tube \Tube\, n. [L. tubus; akin to tuba a trumpet: cf F. tube.]
1. A hollow cylinder, of any material, used for the
conveyance of fluids, and for various other purposes; a
pipe.
2. A telescope. ``Glazed optic tube.'' --Milton.
3. A vessel in animal bodies or plants, which conveys a fluid
or other substance.
4. (Bot.) The narrow, hollow part of a gamopetalous corolla.
5. (Gun.) A priming tube, or friction primer. See under
Priming, and Friction.
6. (Steam Boilers) A small pipe forming part of the boiler,
containing water and surrounded by flame or hot gases, or
else surrounded by water and forming a flue for the gases
to pass through.
7. (Zo["o]l.)
(a) A more or less cylindrical, and often spiral, case
secreted or constructed by many annelids, crustaceans,
insects, and other animals, for protection or
concealment. See Illust. of Tubeworm.
(b) One of the siphons of a bivalve mollusk.
Capillary tube, a tube of very fine bore. See Capillary.
Fire tube (Steam Boilers), a tube which forms a flue.
Tube coral. (Zo["o]l.) Same as Tubipore.
Tube foot (Zo["o]l.), one of the ambulacral suckers of an
echinoderm.
Tube plate, or Tube sheet (Steam Boilers), a flue plate.
See under Flue.
Tube pouch (Mil.), a pouch containing priming tubes.
Tube spinner (Zo["o]l.), any one of various species of
spiders that construct tubelike webs. They belong to
Tegenaria, Agelena, and allied genera.
Water tube (Steam Boilers), a tube containing water and
surrounded by flame or hot gases.
Source: Webster's Revised Unabridged Dictionary (1913)
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