Piece of artwork painted or applied directly on a large permanent surface
A mural is any piece of graphic artwork that is painted or applied directly to a wall, ceiling or other permanent substrate. Mural techniques include fresco, mosaic, graffiti and marouflage. Word mural in art. The word mural is a Spanish adjective that is used to refer to what is attached to a wall. The term mural later became a noun. In art, the word began to be used at the beginning of the 20th century. . In 1906, Dr. Atl issued a manifesto calling for the development of a monumental public art movement in Mexico; he named it in Spanish pintura mural (English: wall painting). .
https://en.wikipedia.org/wiki/Mural