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Definition of Maleic acid
1. Noun. A colorless crystalline compound found in unripe fruit (such as apples or tomatoes or cherries) and used mainly to make polyester resins.
Generic synonyms: Acid
Medical Definition of Maleic acid
1. HOOC-CH==CH-COOH; (Z)-butenedioic acid;the cis isomer of fumaric acid; used for preparing maleate salts of antihistaminics and similar drugs. Synonym: toxilic acid. (05 Mar 2000)