Mixed-media - multi media
In painting, the term has traditionally been applied to combined media in two-dimensional work such as acrylic and watercolor or gouache and tempera. However, with the many experiments of contemporary artists, especially sculptors, the term Mixed-Media or Multi-Media is now applied to the combining into a single work of art a variety of materials, many of them groundbreaking. Examples of combinations that fall into the newer definition are wood, pebbles, bones, glass, plastic, paper, oil paint, found objects and metals. Source: Lonnie Dunbier, AskART.