ox·a·lo·a·ce·tic acid 
(ŏk′sə-lō-ə-sētĭk, ŏk-săl′ō-) or ox·al·a·ce·tic acid (ŏk-săl′ə-sētĭk, ŏk′sə-lə-)
(ŏk′sə-lō-ə-sētĭk, ŏk-săl′ō-) or ox·al·a·ce·tic acid (ŏk-săl′ə-sētĭk, ŏk′sə-lə-)n.
A colorless crystalline dicarboxylic acid, C4H4O5, 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.
[OXAL(IC ACID) + ACETIC ACID.]