Medical Dictionary


noun \ˈmask\

Medical Definition of MASK

:  a protective covering for the face
a :  any of various devices that cover the mouth and nose and are used to prevent inhalation of dangerous substances, to facilitate delivery of a gas (as oxygen or a general anesthetic), or to prevent the dispersal of exhaled infective material—see gas mask, oxygen mask
:  a cosmetic preparation for the skin of the face that produces a tightening effect as it dries
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