Wiktionary
glyoxylic acid
n. (context organic compound English) The aldehyde acid CHO-COOH found in unripe fruit, and as a component of the glyoxylate cycle
Wikipedia
Glyoxylic acid
Glyoxylic acid or oxoacetic acid is an organic compound. Together with acetic acid, glycolic acid, and oxalic acid, glyoxylic acid is one of the C carboxylic acids. It is a colourless solid that occurs naturally and is useful industrially.