Decorated with or having a fresco (a painting done directly on wet plaster); having frescoes painted on it.
From fresco (Italian, from affresco meaning 'on fresh [plaster]') + -ed past participle/adjective suffix.
Frescoed ceilings and walls last thousands of years because the paint literally becomes part of the plaster—Michelangelo's Sistine Chapel is still vivid after 500 years because of this ancient technique.
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