英语释义
1. a crystalline dicarboxylic acid C4H6O5 especially the levorotatory isomer of malic acid that is found in various fruits (such as apples) and is formed as an intermediate in the Krebs cycle
2. any of three optical isomers of a crystalline dicarboxylic acid C4H6O5 especially the one found in various plant juices and formed as an intermediate in the Krebs cycle