| cyclooxygenase | (noun) either of two related enzymes that control the production of prostaglandins and are blocked by aspirin | Synonyms: Cox |
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| oxygen | (noun) 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: atomic number 8, O |
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| oxygenase | (noun) an oxidoreductase that catalyzes the incorporation of molecular oxygen | - |
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| oxygenation | (noun) the process of providing or combining or treating with oxygen | - |
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| polygene | (noun) a gene that by itself has little effect on the phenotype but which can act together with others to produce observable variations | - |
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