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. (Zoöl.) (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. (Zoöl.) Same
as Tubipore. — Tube foot (Zoöl.), 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 (Zoöl.), 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.
Tube, v. t. [imp. & p. p. Tubed (?); p. pr. & vb. n. Tubing.] To
furnish with a tube; as, to tube a well.
Tube"form (?), a. In the form of a tube; tubular; tubiform.
Tube"-nosed` (?), a. (Zoöl.) (a) Having the nostrils prolonged in the
form of horny tubes along the sides of the beak; — said of certain sea
birds. (b) Belonging to the Tubinares.
Tu"ber (?), n.[L., a hump. knob; probably akin to tumere to swell. Cf.
Tumid.] 1. (Bot.) (a) A fleshy, rounded stem or root, usually
containing starchy matter, as the potato or arrowroot; a thickened
root-stock. See Illust. of Tuberous. (b) A genus of fungi. See Truffle.