A ball (formal dance) in which the dancers wear masks or fancy dress

A hard white hockey mask such as popularised by the character Jason Voorhees in the Friday the 13th films.

plural of masking tape

A pressure-sensitive tape made of a thin and easy-to-tear paper characterized by its ease of removal, not leaving adhesive behind. It is used mainly in painting, to mask off areas that should not be painted.

(medicine) Masklike facial expression, often noted in Parkinson's disease.

An application of mud, clay, etc. to the skin of the face for cosmetic purposes.

A facemask worn to catch droplets and aerosols, which contain bacteria and viruses. / A medical-grade mask worn during medical procedures.

(medicine, infectious disease) A mask worn to catch bacteria shed in liquid droplets and aerosols from the wearer's mouth and nose. / A medical-grade mask worn during surgery.

A protective mask which covers the mouth and nose of the wearer, worn when in a dusty atmosphere, or when doing work which creates dust.

Corystes cassivelaunus, a burrowing crab with patterns on the carapace which may resemble a human face.