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ma·lo·nic acid | \ mə-ˈlōn-ik- 
, -ˈlän- \
, -ˈlän- \Medical Definition of malonic acid
: a crystalline dicarboxylic acid CH2(COOH)2 used especially in the form of its diethyl ester in organic synthesis (as of barbiturates and vitamins of the B complex)
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