Mask

A face covering. Usually it is something worn on the face, with openings for the eyes, to conceal one's identity, either for partying (as at a masquerade ball), to frighten or amuse (as at Halloween), for ritual, or for performance (as by dancers, or by actors in Greek, Roman, and Japanese theater.) It may be worn principally to protect the face (as a gas mask, or a hockey mask, or a physician's mask, etc.) It may also be any two- or three-dimensional representation of a face — as in the covering of an Egyptian mummy's face depicting the face of the deceased. A mask can be a mold of a person's face — a death mask if made after death, a life mask if made before it.

Or, it may refer to an opaque edge or area placed between an image and a photosensitive surface to prevent its exposure to certain portions of the image. An example of this is a frisket. (Artlex.com)

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