DICT.TW Dictionary Taiwan

 Vault n.
 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, used for storing articles, for a prison, for interment, or the like; a cell; a cellar. “Charnel vaults.”
    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.  A leap or bound. Specifically: -- (a) Man. The bound or leap of a horse; a curvet. (b) 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.

 Bar·rel n.
 1. A round vessel or cask, of greater length than breadth, and bulging in the middle, made of staves bound with hoops, and having flat ends or heads; as, a cracker barrel.  Sometimes applied to a similar cylindrical container made of metal, usually called a drum.
 2. The quantity which constitutes a full barrel.  This varies for different articles and also in different places for the same article, being regulated by custom or by law.  A barrel of wine is 31½ gallons; a barrel of flour is 196 pounds.
 3. A solid drum, or a hollow cylinder or case; as, the barrel of a windlass; the barrel of a watch, within which the spring is coiled.
 4. A metallic tube, as of a gun, from which a projectile is discharged.
 5. A jar. [Obs.]
 6. Zool. The hollow basal part of a feather.
 Barrel bulk Com., a measure equal to five cubic feet, used in estimating capacity, as of a vessel for freight.
 Barrel drain Arch., a drain in the form of a cylindrical tube.
 Barrel of a boiler, the cylindrical part of a boiler, containing the flues.
 Barrel of the ear Anat., the tympanum, or tympanic cavity.
 Barrel organ, an instrument for producing music by the action of a revolving cylinder.
 Barrel vault. See under Vault.

 barrel vault
      n : the simplest form of vault; a single continuous arch