oxygen mask
US /ˈɑːk.sɪ.dʒən ˌmæsk/
UK /ˈɑːk.sɪ.dʒən ˌmæsk/
1.
a mask placed over the nose and mouth and connected to a supply of oxygen
:
•
The flight attendant demonstrated how to use the oxygen mask.
•
He needed an oxygen mask after the accident.