coving

plural covings

1. A concave surface forming a junction between a ceiling and a wall.

   Aluminium treadplate is used for the corridor, kitchen, and pantry floor, with aluminium covings.

   1960 March 28, “Restaurant Cars for British Railways”, in Railway Magazine, page 166

   1 more example

   The gilt lantern burned palely in the stairwell, but in the dining room the ordinary shadows deepened in the corners and hung like smoke in the coving of the ceiling.

   2004, Alan Hollinghurst, The Line of Beauty […], London: Picador, →ISBN

2. The vertical sides connecting the jambs with the breast of a fireplace.
3. urban studiesA method of urban planning used in subdivision and redevelopment of cities characterized by non-uniform lot shapes.