1mask 
/ˈmæsk, Brit ˈmɑ:sk/ noun
plural masks /ˈmæsk, Brit ˈmɑ:sk/ noun [count] 1 : a covering for your face or for part of your face: such as a : a covering used to hide or disguise your face
▪ a Halloween mask ▪ Everyone wore costumes and masks to the dance. ▪ The robbers wore masks.
b : a covering used to protect your face or cover your mouth
▪ Doctors wear surgical masks in the operating room. ▪ a (baseball) catcher's mask — see picture at scuba diving; see also face mask, gas mask, oxygen mask, ski mask 2 : a way of appearing or behaving that is not true or real — usually singular ▪ Her anger and resentment were hidden behind a mask of friendship. [=she pretended to be friendly but was really angry and resentful]
▪ a Halloween mask ▪ Everyone wore costumes and masks to the dance. ▪ The robbers wore masks.
b : a covering used to protect your face or cover your mouth
▪ Doctors wear surgical masks in the operating room. ▪ a (baseball) catcher's mask — see picture at scuba diving; see also face mask, gas mask, oxygen mask, ski mask
