English noun: O |
1. | O (substance) 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 |
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| Synonyms | atomic number 8, oxygen |
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| Broader (hypernym) | chemical element, element, gas |
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| Narrower (hyponym) | liquid oxygen, LOX |
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| Substance meronym | air, H2O, ozone, water |
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2. | O (communication) the 15th letter of the Roman alphabet |
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| Broader (hypernym) | alphabetic character, letter, letter of the alphabet |
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| Member meronym | Latin alphabet, Roman alphabet |
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3. | O (body) the blood group whose red cells carry neither the A nor B antigens |
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| Samples | People with type O blood are universal donors.
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| Synonyms | group O, type O |
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| Broader (hypernym) | blood group, blood type |
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