Definition of "oxygen"
noun:
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A chemical element (symbol O) with an atomic number of 8 and relative atomic mass of 15.9994.
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Molecular oxygen (O2), a colorless, odorless gas at room temperature.
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A mixture of oxygen and other gases, administered to a patient to help him or her to breathe.
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An atom of this element.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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