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aldehyde Line breaks: al¦de|hyde
Pronunciation: /ˈaldɪhʌɪd/

Definition of aldehyde in English:


An organic compound containing the group —CHO, formed by the oxidation of alcohols. Typical aldehydes include methanal (formaldehyde) and ethanal (acetaldehyde).
Example sentences
  • Water, ethanol, volatile organic acids, aldehydes, esters, acetals, and ketones, many of them powerfully aromatic, are among the azeotrope components in wines.
  • Included among these compounds are some of the best known of all chemical families, including the hydrocarbons, alcohols, ethers, aldehydes and ketones, and organic acids.
  • Over time, however, it oxidizes and chemically degrades to form alcohols, ketones, aldehydes, acids and esters.


Pronunciation: /ˌaldɪˈhɪdɪk/
Example sentences
  • Reactions that occur between the aldehydic groups and other amino acids of adjoining molecules lead to cross-links between the molecules and the self-assembly into fibers.
  • The aldehydic proton gives a strongly deshielded resonance signal in the H - 1 NMR spectrum.
  • The components have high absorption characteristics resulting from the presence of carboxylic, hydroxylic, and aldehydic functional groups.


Mid 19th century: shortened from Latin alcohol dehydrogenatum 'alcohol deprived of hydrogen'.

Definition of aldehyde in:
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