[1] : The Collaborative International Dictionary of English v.0.48

vault \vault\ vaddlt; see note, below, n. oe. voute, of.
   voute, volte, f. vo^ute, 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.
   1913 webster
   1. arch. an arched structure of masonry, forming a ceiling
      or canopy.
      1913 webster

            the long-drawn aisle and fretted vault. --gray.
      1913 webster

   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." --milton.
      1913 webster

            the silent vaults of death.           --sandys.
      1913 webster

            to banish rats that haunt our vault.  --swift.
      1913 webster

   3. the canopy of heaven; the sky.
      1913 webster

            that heaven's vault should crack.     --shak.
      1913 webster

   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:
      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.
          1913 webster

   note: the l in this word was formerly often suppressed in
         pronunciation.
         1913 webster

   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.
      1913 webster
see also:
voluble vault volt volute barrel vault cradle vault 
cylindrical vault wagon vault rampant vault rampant coved vault 
cove groined vault rampant vault ribbed vault vault light 

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Drummond Light, definition of term: Drummond Light
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Calcium Light, definition of term: Calcium Light
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Barrel Vault, definition of term: Barrel Vault
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