English > O: 3 senses > noun 1, substance| Meaning | A nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes / constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth's crust. |
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| Synonyms | oxygen, atomic number 8 |
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| Narrower | liquid oxygen, LOX | A bluish translucent magnetic liquid / liquid obtained by compressing gaseous oxygen and then cooling it below its boiling point |
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| Broader | chemical element, element | Any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter |
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| gas | A fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely |
| Substance of | air | A mixture of gases (especially oxygen) required for breathing |
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| ozone | A colorless gas (O3) soluble in alkalis and cold water |
| water, H2O | binary compound that occurs at room temperature as a clear colorless odorless tasteless liquid / liquid |
| Spanish | número atómico 8, O, oxigeno, oxígeno |
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| Catalan | número atòmic 8, O, oxigen |
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