- 1a covering for part or all of the face, worn to hide or protect it a gas/surgical mask The robbers were wearing stocking masks. He was carrying a baseball bat, gloves, and a catcher's mask. see also oxygen mask
- 2 something that covers your face and has another face painted on it The kids were all wearing Halloween masks. see also death mask
- 3 a thick cream made of various substances that you put on your face and neck in order to improve the quality of your skin a facial mask
- 4[usually singular] a manner or an expression that hides your true character or feelings He longed to throw off the mask of respectability. Her face was a cold blank mask.