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oxalic acid Definition
oxalic acidnoun 1. chem.(formula (COOH)2) a highly poisonous white crystalline solid that occurs in the leaves of rhubarb, wood sorrel and certain other plants, used as a rust and stain remover, a cleaner for car radiators and in tanning and bleaching. Also called ethanedioic acid.
Etymology: 18c: from
oxalis.