Definition of formaldehyde noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//fɔːˈmældɪhaɪd//
    ; NAmE NAmE//fɔːrˈmældɪhaɪd//
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  1. 1(symbol CH2O) a gas with a strong smell
  2. 2(specialist formalin
    BrE BrE//ˈfɔːməlɪn//
    ; NAmE NAmE//ˈfɔːrməlɪn//
    a liquid made by mixing formaldehyde and water, used for preserving biological specimens, making plastics and as a disinfectant His most famous artistic offering consists of a dead shark floating in a tank of formaldehyde.
  3. Word Originlate 19th cent.: blend of formic acid and aldehyde.
See the Oxford Advanced American Dictionary entry: formaldehyde