| oxacillin | (noun) a form of penicillin resistant to penicillinase and effective against penicillin-resistant staphylococci | - |
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| oxalacetate | (noun) a salt or ester of oxalacetic acid | Synonyms: oxaloacetate |
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| oxalate | (noun) a salt or ester of oxalic acid | - |
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| oxalic | (adjective) of or derived from oxalic acid | - |
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| oxalis | (noun) any plant or flower of the genus Oxalis | Synonyms: sorrel, wood sorrel |
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| oxaloacetate | (noun) a salt or ester of oxalacetic acid | Synonyms: oxalacetate |
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| oxaprozin | (noun) a nonsteroidal anti-inflammatory drug (trade name Daypro) | Synonyms: Daypro |
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| oxazepam | (noun) a tranquilizing drug (trade name Serax) used to treat anxiety and insomnia and alcohol withdrawal | Synonyms: Serax |
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