1a covering for all or part of the face, worn as a disguise, or to amuse or frighten others.
2a covering made of fibre or gauze and fitting over the nose and mouth to protect against air pollutants, or made of sterile gauze and worn to prevent infection of the wearer or (in surgery) of the patient.
a protective covering fitting over the whole face, worn in fencing, ice hockey, and other sports.
a respirator used to filter inhaled air or to supply gas for inhalation.
a face pack.
3a likeness of a person’s face moulded or sculpted in clay or wax.
a person’s face regarded as having set into a particular expression:his face was a mask of rage
a hollow model of a human head worn by ancient Greek and Roman actors.
the face or head of a fox or other game animal, as a trophy.
4a manner or expression that hides one’s true character or feelings:I let my mask of respectability slip
5 Photography a piece of material such as card used to cover a part of an image that is not required when exposing a print.
6 Electronics a patterned metal film used in the manufacture of microcircuits to allow selective modification of the underlying material.
7 Entomology the enlarged labium of a dragonfly larva, which can be extended to seize prey.
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Universal
1cover (the face) with a mask:he had been masked, bound, and abducted
2conceal (something) from view:the poplars masked a factory
(of a taste, smell, etc.) prevent the perception of (another sensation):brandy did not completely mask the bitter taste
3cover (an object or surface) so as to protect it during painting:mask off doors and cupboards with sheets of plastic
