1a covering for part or all of the face, worn to hide or protect ita gas/surgical maskThe robbers wore stocking masks. see also oxygen mask2something that covers your face and has another face painted on itThe kids were all wearing animal masks. see also death mask3a thick cream made of various substances that you put on your face and neck in order to improve the quality of your skina face mask4[usually singular]a manner or an expression that hides your true character or feelingsHe longed to throw off the mask of respectability.Her face was a cold blank mask.
mɑːsk
mæsk