What is "beta-hydroxybutyric acid"

n. beta derivative of hydroxybutyric acid that is found in the blood and urine in some cases of impaired metabolism

beta-Hydroxybutyric acid (also known as beta-hydroxybutyrate, 3-hydroxybutyric acid or 3-hydroxybutyrate) is an organic compound with the formula CHCH(OH)CHCOH. It is a beta hydroxy acid. It is a chiral compound having two enantiomers, D-3-hydroxybutyric acid and L-3-hydroxybutyric acid. Its oxidized and polymeric derivatives occur widely in nature.