oxygen mask

English Thesaurus

1. a breathing device that is placed over the mouth and nose; supplies oxygen from an attached storage tank (noun.artifact)

hypernym	:	breathing apparatus, breathing device, breathing machine, ventilator,
definition	:	a device that facilitates breathing in cases of respiratory failure (noun.artifact)

part meronym	:	aqua-lung, aqualung, scuba,
definition	:	a device (trade name Aqua-Lung) that lets divers breathe under water; scuba is an acronym for self-contained underwater breathing apparatus (noun.artifact)