combining form
indicating that a chemical compound contains oxygen, used esp to denote that a heterocyclic compound is derived from a specified compound by replacement of a carbon atom with an oxygen atom: oxazine


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  • Oxacillin

    [ok-suh-sil-in] /ˌɒk səˈsɪl ɪn/ noun, Pharmacology. 1. a semisynthetic penicillin, C 1 9 H 1 9 N 3 O 5 S, used in the treatment of serious staphylococcal infections. oxacillin ox·a·cil·lin (ŏk’sə-sĭl’ĭn) n. A semisynthetic penicillin effective against penicillin-resistant infections, especially those of staphylococci.

  • Oxalacetic acid

    oxaloacetic acid (ŏk’sə-lō-ə-sē’tĭk, ŏk-sāl’ō-) or oxalacetic acid (ŏk’sə-lō-ə-sē’tĭk, ŏk-sāl’ō-) A colorless crystalline organic acid that is formed by oxidation of malic acid in the Krebs cycle and by transamination from aspartic acid. It is important as an intermediate in the metabolism of carbohydrates and a precursor in the synthesis of amino acids. Chemical formula: C4H4O5.

  • Oxalate

    [ok-suh-leyt] /ˈɒk səˌleɪt/ noun, Chemistry. 1. any salt or ester of , occurring in plants, especially spinach, rhubarb, and certain other vegetables and nuts, and capable of forming an insoluble salt with calcium and interfering with its absorption by the body. /ˈɒksəˌleɪt/ noun 1. a salt or ester of oxalic acid oxalate ox·a·late (ŏk’sə-lāt’) n. […]

  • Oxalate calculus

    oxalate calculus n. A hard urinary calculus composed of calcium oxalate; it can be smooth or covered with minute sharp spines.

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