maleic acid

From Latin malum (“apple”). Related to malic acid.

maleic acid (uncountable)

1. (organic chemistry) an unsaturated organic dicarboxylic acid, cis-butenedioic acid; HOOCCH=CHCOOH, the geometric isomer of fumaric acid; it is found in unripe fruit, and is used industrially in the production of polyester resins

• cis-butenedioic acid
• pyromalic acid

• maleate
• maleic anhydride