oxygen
Proposed by a contributor, not yet supported by evidence.
Also seen as: oxygens
Sense 1
The chemical element (symbol O) with an atomic number of 8 and relative atomic mass of 15.9994. It is a colorless and odorless gas. Sometimes called elemental oxygen to distinguish it from molecular oxygen.
nguyên tố hóa học (kí hiệu O) với số nguyên tử 8
Machine-translated — suggest a fix
Noun
Examples
Usage example from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01)
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01 via kaikki.org).
Sense 2
Molecular oxygen (O₂), a colorless, odorless gas at room temperature.
Oxy (O₂), một khí không màu, không mùi ở nhiệt độ phòng
Machine-translated — suggest a fix
Noun
Examples
Usage example from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01)
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01 via kaikki.org).
Common questions
What does “oxygen” mean?
The chemical element (symbol O) with an atomic number of 8 and relative atomic mass of 15.9994. It is a colorless and odorless gas. Sometimes called elemental oxygen to distinguish it from molecular oxygen.
Is “oxygen” formal or informal?
No register label has been reviewed yet — treat it as neutral and check the usage notes above.