Definition
Oxygen produced and certified to aviation breathing-gas standards, with extremely low moisture content to prevent ice from forming in regulators, valves, and lines at the low temperatures encountered at altitude.
Plain English
It is breathing oxygen made specially dry, so the cold air at high altitude does not let any moisture in it freeze and block the system.
Context Anchor
Seen in aircraft oxygen system servicing, maintenance records, and high-altitude flight equipment discussions.
Derivation
Aviator comes from Latin avis, meaning “bird,” and came to mean a person who flies aircraft. Oxygen was coined from Greek roots meaning “acid-forming,” an old scientific idea about oxygen. In this term, the important part is aviator’s: it marks this as oxygen prepared for aircraft use, not just ordinary bottled oxygen.
Why Pilots Care
Using the correct aviator’s oxygen prevents moisture from freezing in lines and regulators at altitude and avoids contamination that could lead to hypoxia.
Grounding Statement
At altitude, even a small amount of water in an oxygen system can freeze, so aircraft oxygen must be unusually dry.
Intuition Check
Aviator’s oxygen does not mean any oxygen a pilot happens to use. It means oxygen that meets aircraft breathing-use standards, especially for dryness.
Example Sentence 1
Before the high-altitude flight, the technician serviced the cylinder with aviator's oxygen to meet the manufacturer's specification.
Example Sentence 2
Before the high-altitude flight, the pilot verified that the aviator’s oxygen supply met all certification standards.