BARREL VAULT • FREE-TRANSLATOR.COM • Definition of Barrel vault

... elaborate facades. The gates of cities, of palaces and temples, of most buildings, in fact, that have any monumental character, are crowned by an arch, the curve of which is accentuated by a brilliantly coloured soffit. This arch is continued as a barrel vault for the whole length of the passage leading into the interior, and these passages are sometimes very long. Vaults would also, in all probability, have been found over those narrow chambers that are so numerous in Assyrian palaces were it not for the universal ruin that ...

— A History of Art in Chaldaea & Assyria, v. 1 • Georges Perrot