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The following 3 entries include the term maleic.
maleic acid
noun: a crystalline dicarboxylic acid C4H4O4 that is isomeric with fumaric acid and is used especially in organic synthesis
maleic anhydride
noun: a caustic crystalline cyclic anhydride C4H2O3 used especially in making resins
maleic hydrazide
noun: a crystalline cyclic hydrazide C4H4N2O2 used to slow plant growth
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Merriam-Webster unabridged