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Aldehyde

n.
  1. (Chem.) A colorless, mobile, and very volatile liquid obtained from alcohol by certain processes of oxidation.
  2. (Chem.) Any compound having the group -CHO. Methyl aldehyde, the simplest aldehyde, is more commonly called formaldehyde, H-CHO, and acetic aldehyde is now more commonly called acetaldehyde. The higher aldehydes may be solids. A reducing sugar typically contains the aldehyde group.
    3. Aldehyde ammonia (Chem.),
    a compound formed by the union of aldehyde with ammonia.