Longman Dictionary of Contemporary English
Wikipedia
Mixed media, in visual art, refers to an artwork in the making of which more than one medium has been employed.
There is an important distinction between "mixed media" artworks and " multimedia art ". "Mixed media" tends to refer to a work of visual art that combines various traditionally distinct visual art media—for example, a work on canvas that combines paint, ink, and collage could properly be called a "mixed media" work, but not a work of "multimedia art." The term "multimedia art" implies a broader scope than "mixed media", combining visual art with non-visual elements (such as recorded sound, for example) or with elements of the other arts (such as literature, drama, dance, motion graphics, music, or interactivity).
When creating a painted or photographed work using mixed media it is important to choose the layers carefully and allow enough drying time between the layers to ensure the final work will have structural integrity. If many different media are used it is equally important to choose a sturdy foundation upon which the different layers are imposed.
Many effects can be achieved by using mixed media. Found objects can be used in conjunction with traditional artist media to attain a wide range of self-expression.
Some children's picture books also utilise mixed media illustrations. For example, 's Nachts by Wolf Erlbruch.
Usage examples of "mixed media".
Feeney hunched his shoulders and stared at the mixed media ugliness of a squat toad-like creature several feet away.
The Bopping Elf proves that the potential exists for some truly interesting mixed media presentations.