molding
noun /ˈməʊldɪŋ/
  /ˈməʊldɪŋ/
(US English) (British English moulding)
 [countable, uncountable]- a narrow piece of plastic, stone, wood, etc. around the top edge of a wall, on a door, etc., usually for decoration- There were elaborate plaster moldings around the ceiling.
- You can fit a strip of hardwood cove molding into the corner.