American Heritage® Dictionary of the English Language, Fourth Edition
- n. Air in its liquid state, intensely cold and bluish, obtained by cooling and compression.
- n. air which is in a liquid state due to being pressurised or kept at a low temperature, or both, usually for storage and transport purposes.
GNU Webster's 1913
- (Physics) A transparent limpid liquid, slightly blue in color, consisting of a mixture of liquefied oxygen and nitrogen. It is prepared by subjecting air to great pressure and then cooling it by its own expansion to a temperature below the boiling point of its constituents (N: -194° C; O: -183° C.).
- n. air in a liquid state
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