Covered with tiles — those flat, hard, usually square pieces of baked clay, stone or plastic that people put on floors, walls and roofs. 'A tiled bathroom' is one whose walls and floor are covered in tiles; 'a tiled roof' has tiles instead of metal sheets or thatch. It works as an adjective in front of a noun (a tiled kitchen) and also as the past form of the verb 'tile' (they tiled the whole floor in one weekend). The word carries a quiet feeling with it that dictionaries often skip: tiled surfaces are the ones you can wash. So 'tiled' tends to appear where cleanliness and water matter — bathrooms, kitchens, swimming pools, hospitals, the old wet market — and it can suggest cool, hard, echoing, a bit institutional. A writer who says 'the tiled corridor' is usually telling you the place was clean and slightly unwelcoming. In computing it means something else: windows arranged side by side, edge to edge, filling the screen without overlapping, like tiles on a floor.