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| 1. | [ noun ] (immunology) the blood group whose red cells carry neither the A nor B antigens | |
| Synonyms: | group_O type_O | |
| Examples: | "people with type O blood are universal donors" |
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| Related terms: | blood_group | |
| 2. | [ noun ] (chemistry) a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth's crust | |
| Synonyms: | oxygen atomic_number_8 | |
| Related terms: | gas chemical_element liquid_oxygen air water ozone oxygenize oxygenate | |
| 3. | [ noun ] the 15th letter of the Roman alphabet | |
| Related terms: | letter Roman_alphabet | |
| Similar spelling: |
ow Ou oh owe |
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