fresco
US /ˈfres.koʊ/
UK /ˈfres.koʊ/

1.
a painting done rapidly in watercolor on wet plaster on a wall or ceiling, so that the colors penetrate the plaster and become fixed as it dries
:
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The artist spent months working on the elaborate fresco in the chapel.
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Ancient Roman villas often featured beautiful frescoes depicting daily life.
1.
paint in fresco
:
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The artist decided to fresco the entire dome with scenes from mythology.
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It takes great skill to properly fresco a large surface.