mask

A covering worn on the face to conceal one’s identity, as.

A covering, as of cloth, that has openings for the eyes, entirely or partly conceals the face, and is worn especially at a masquerade ball.

A grotesque or comical representation of a face, worn especially to frighten or amuse, as at Halloween.

A facial covering worn for ritual.

A figure of a head worn by actors in Greek and Roman drama to identify a character or trait and to amplify the voice.

A protective covering for the face or head.

A gas mask.

A usually rubber frame forming a watertight seal around the eyes and nose and containing a transparent covering for use in seeing underwater.

A covering for the nose and mouth that is used for inhaling oxygen or an anesthetic.