What is "wagon vault"

Vault \Vault\ (v[add]lt; see Note, below), n. [OE. voute, OF. voute, volte, F. vo[^u]te, LL. volta, for voluta, volutio, fr. L. volvere, volutum, to roll, to turn about. See Voluble, and cf. Vault a leap, Volt a turn, Volute.]

1. (Arch.) An arched structure of masonry, forming a ceiling or canopy.

   The long-drawn aisle and fretted vault.
   --Gray.

2. An arched apartment; especially, a subterranean room, use for storing articles, for a prison, for interment, or the like; a cell; a cellar. ``Charnel vaults.''
   --Milton.

   The silent vaults of death.
   --Sandys.

   To banish rats that haunt our vault.
   --Swift.

3. The canopy of heaven; the sky.

   That heaven's vault should crack.
   --Shak.

4. [F. volte, It. volta, originally, a turn, and the same word as volta an arch. See the Etymology above.] A leap or bound. Specifically:

   1. (Man.) The bound or leap of a horse; a curvet.

   2. A leap by aid of the hands, or of a pole, springboard, or the like.

      Note: The l in this word was formerly often suppressed in pronunciation.

      Barrel vault, Cradle vault, Cylindrical vault, or Wagon vault (Arch.), a kind of vault having two parallel abutments, and the same section or profile at all points. It may be rampant, as over a staircase (see Rampant vault, under Rampant), or curved in plan, as around the apse of a church.

      Coved vault. (Arch.) See under 1st Cove, v. t.

      Groined vault (Arch.), a vault having groins, that is, one in which different cylindrical surfaces intersect one another, as distinguished from a barrel, or wagon, vault.

      Rampant vault. (Arch.) See under Rampant.

      Ribbed vault (Arch.), a vault differing from others in having solid ribs which bear the weight of the vaulted surface. True Gothic vaults are of this character.

      Vault light, a partly glazed plate inserted in a pavement or ceiling to admit light to a vault below.

Wagon \Wag"on\, n. [D. wagen. [root]136. See Wain.]

1. A wheeled carriage; a vehicle on four wheels, and usually drawn by horses; especially, one used for carrying freight or merchandise.

   Note: In the United States, light wagons are used for the conveyance of persons and light commodities.

2. A freight car on a railway. [Eng.]

3. A chariot [Obs.]
   --Spenser.

4. (Astron.) The Dipper, or Charles's Wain.

   Note: This word and its compounds are often written with two g's (waggon, waggonage, etc.), chiefly in England. The forms wagon, wagonage, etc., are, however, etymologically preferable, and in the United States are almost universally used.

   Wagon boiler. See the Note under Boiler, 3.

   Wagon ceiling (Arch.), a semicircular, or wagon-headed, arch or ceiling; -- sometimes used also of a ceiling whose section is polygonal instead of semicircular.

   Wagon master, an officer or person in charge of one or more wagons, especially of those used for transporting freight, as the supplies of an army, and the like.

   Wagon shoe, a skid, or shoe, for retarding the motion of a wagon wheel; a drag.

   Wagon vault. (Arch.) See under 1st Vault.