a covering for all or part of the face, worn as a disguise, or to amuse or frighten others

a covering worn over the mouth and nose in order to reduce the transmission of infectious agents, or to prevent the inhalation of pollutants and other harmful substances

a face pack

this exfoliating mask helps clear your pores and leaves your skin feeling soft and healthy

a likeness of a person's face moulded or sculpted in clay or wax

a manner or expression that hides one's true character or feelings

I let my mask of respectability slip

a piece of material such as card used to cover a part of an image that is not required when exposing a print

a patterned metal film used in the manufacture of microcircuits to allow selective modification of the underlying material

the enlarged labium of a dragonfly larva, which can be extended to seize prey

cover (the face) with a mask

he had been masked, bound, and abducted

conceal (something) from view

the poplars masked a factory

cover (an object or surface) so as to protect it during painting

mask off doors and cupboards with sheets of plastic