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countable and uncountable, plural oxygens
The chemical element (symbol O) with an atomic number of 8 and relative atomic mass of 15.9994. It is a colorless and odorless gas. examples
Molecular oxygen (O2), a colorless, odorless gas at room temperature, also called dioxygen. quotations examples
Oxygen levels on Earth skyrocketed 2.4 billion years ago, when cyanobacteria evolved photosynthesis: the ability to convert water and carbon dioxide into carbohydrates and waste oxygen using solar energy. The evolutionary precursor of photosynthesis is still under debate, and a new study sheds light.
2013 September-October, Katie L. Burke, “In the News”, in American Scientist
(medicine) A mixture of oxygen and other gases, administered to a patient to help them breathe. examples
(countable) An atom of this element. quotations examples
Look first at any structure to see if there is a carbon with two oxygens attached. Hemiacetals, hemiketals, acetals, and ketals are all alike in that regard.
2013, Spencer L. Seager, Michael R. Slabaugh, Chemistry for Today: General, Organic, and Biochemistry, page 479
(figurative) A condition or environment in which something can thrive. examples