Phrase guide

maleic acid

noun · 2 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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1

noun

Meaning 1

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

Definition source: English Wiktionary via Wiktextract

Usage: uncountable

Topics: chemistry, natural-sciences, organic-chemistry, physical-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

a colorless crystalline compound found in unripe fruit (such as apples or tomatoes or cherries) and used mainly to make polyester resins

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: acid

History

Etymology

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

Across languages

Translations

6 source translations are retained for this English entry.

  • Chinese Mandarin: 馬來酸 /马来酸 (mǎláisuān) — an unsaturated organic dicarboxylic acid
  • Indonesian: asam maleat — an unsaturated organic dicarboxylic acid
  • Javanese: asem maléyat — an unsaturated organic dicarboxylic acid
  • Romanian: acid maleic — an unsaturated organic dicarboxylic acid
  • Russian: малеи́новая кислота́ (maleínovaja kislotá) — an unsaturated organic dicarboxylic acid
  • Swedish: maleinsyra — an unsaturated organic dicarboxylic acid