What does "breathable" mean?
suitable for breathing
adj ·Rare ·Advanced level
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"The Wards are open-topped, with skyscrapers rising from the superstructure. Towers are sealed against vacuum, as the breathable atmosphere envelope is only maintained to a height of about seven meters. The atmosphere is contained by the centrifugal force of rotation and a "membrane" of dense, colorless sulphur hexafluoride gas, held in place by carefully managed mass effect fields."
"breathable paint"
"The atmosphere of this planet is not breathable."
suitable for breathing
Common synonyms include: air permeable, airier, amphibian skin, life-supporting, oxygen-rich, permeable.
The atmosphere of this planet is not breathable.
Pronounced /ˈbɹiːðəbəl/.
From breathe + -able.