breathing mask
nounUK /ˈbriː.ðɪŋ mɑːsk/
US /ˈbriː.ðɪŋ mæsk/
A breathing mask is a cover you wear over your nose and mouth to help you breathe clean air.
The firefighter put on a breathing mask before going into the smoky building.
RELATED WORDS
OTHER MEANINGS
2. A device worn by pilots or divers that supplies air for breathing.
The pilot checked his breathing mask before takeoff.
3. A medical mask that helps a patient receive oxygen.
The nurse placed a breathing mask over the patient's face.
4. A mask that filters dust or harmful particles from the air.
Workers in the dusty factory wore breathing masks all day.