mural
US /ˈmjʊr.əl/
UK /ˈmjʊr.əl/

1.
a painting or other art form executed directly on a wall or ceiling.
:
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The artist spent months creating the vibrant mural on the side of the building.
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Ancient cave paintings are considered early forms of murals.
1.
of or relating to a wall
:
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The architect designed a building with a large mural space.
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The ancient city walls had intricate mural decorations.