Exact Match:
- oxygen
- a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth's crust
Synonyms:
- acetylene,
- ammonia,
- argon,
- asphyxiating gas,
- butane,
- carbon dioxide,
- carbon monoxide,
- chlorine,
- coal gas,
- ethane,
- ether,
- ethylene,
- fluorine,
- formaldehyde,
- helium,
- hydrogen,
- illuminating gas,
- krypton,
- lewisite,
- marsh gas,
- methane,
- mustard gas,
- natural gas,
- neon,
- nitrogen,
- ozone,
- poison gas,
- propane,
- radon,
- sewer gas,
- xenon