formaldehydePronunciation: /fɔːˈmaldɪhʌɪd/Definition of formaldehyde noun [mass noun] Chemistry a colourless pungent gas in solution made by oxidizing methanol. Alternative name: methanal; chemical formula: CH2O Origin: late 19th century: blend of formic acid and aldehydeformaldehyde in other Oxford dictionaries Definition of formaldehyde in the US English dictionary
