The Collaborative International Dictionary of English v.0.48:

Cove \Cove\, v. t. [imp. & p. p. Coved (k?vd); p. pr. & vb. n.
   Coving.] (Arch.)
   To arch over; to build in a hollow concave form; to make in
   the form of a cove.
   [1913 Webster]

         The mosques and other buildings of the Arabians are
         rounded into domes and coved roofs.      --H.
                                                  Swinburne.
   [1913 Webster]

   Coved ceiling, a ceiling, the part of which next the wail
      is constructed in a cove.

   Coved vault, a vault composed of four coves meeting in a
      central point, and therefore the reverse of a groined
      vault.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Coving \Cov"ing\, n. (Arch.)
      (a) A cove or series of coves, as the concaved surface
          under the overhang of a projecting upper story.
      (b) The splayed jambs of a flaring fireplace.
          [Webster 1913 Suppl.]