Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Origin: formic ( FORMIC ACID) + aldehyde type of chemical

formaldehyde

 noun
     
Related topics: Chemistry
for‧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
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