Definition of mask noun from the Oxford Advanced Learner's Dictionary

     

    mask

     noun
    noun
    BrE BrE//mɑːsk//
     
    ; NAmE NAmE//mæsk//
     
    Operations, Diving, Beauty products
     
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  1. 1 a covering for part or all of the face, worn to hide or protect it a gas/surgical mask The robbers wore stocking masks. see also oxygen mask See related entries: Operations, Diving
  2. 2 something that covers your face and has another face painted on it The kids were all wearing animal masks. see also death mask
  3. 3a thick cream made of various substances that you put on your face and neck in order to improve the quality of your skin a face mask See related entries: Beauty products
  4. 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.
  5. Word Origin mid 16th cent.: from French masque, from Italian maschera, mascara, probably from medieval Latin masca ‘witch, spectre’, but influenced by Arabic mask̲ara ‘buffoon’.Extra examples For a moment her mask slipped, and I saw how scared she really was. He was hiding behind a mask of indifference but she wasn’t fooled. Her face was a blank mask as she answered my question. His fooling around is a mask for his lack of confidence. In the second part of the play, the actors take off their masks. She wore a mask over her face. The man’s face was hidden by a mask. Two eyes glared at him from beneath the mask. two men in black masks Behind the mask of indifference she was grinning. He looked at me, his face a mask of innocence. The mask of politeness slipped for a moment.
See the Oxford Advanced American Dictionary entry: mask