noun🔗ShareFormaldéhydeThe simplest aldehyde, HCHO, a colourless gas that has many industrial applications; it dissolves in water to give formol (10%) and formalin."To preserve the biology specimens, the science teacher used a solution containing formaldehyde. "Pour conserver les spécimens de biologie, le professeur de sciences a utilisé une solution contenant du formaldéhyde.compoundsubstancechemistrymaterialscienceindustryChat with AIVocabulary GamePractice Reading