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Date: 1800-1900 Origin: formic ( FORMIC ACID) + aldehyde type of chemical formaldehyde noun Related topics: Chemistryfor???mal???de???hyde [uncountable]HC a strong-smelling gas that can be mixed with water and used for preserving things such as dead animals to be used in science etc: frogs preserved in formaldehyde Definition from the Longman Dictionary of Contemporary English Advanced Learner's D
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