from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Any of a class of highly reactive organic chemical compounds obtained by oxidation of primary alcohols, characterized by the common group CHO, and used in the manufacture of resins, dyes, and organic acids.
  • n. See acetaldehyde.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any of a large class of reactive organic compounds (R·CHO) having a carbonyl functional group attached to one hydrocarbon radical and a hydrogen atom.

from the GNU version of the Collaborative International Dictionary of English

  • n. A colorless, mobile, and very volatile liquid obtained from alcohol by certain processes of oxidation.
  • n. 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.

from The Century Dictionary and Cyclopedia

  • n. A transparent colorless liquid, CH3COH, of pungent suffocating odor, produced by the oxidation of ordinary alcohol.
  • n. The general name of a class of compounds intermediate between alcohols and acids, derived from their corresponding primary alcohols by the oxidation and removal of two atoms of hydrogen, and converted into acids by the addition of an atom of oxygen.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. any of a class of highly reactive chemical compounds; used in making resins and dyes and organic acids


from The American Heritage® Dictionary of the English Language, 4th Edition

German Aldehyd, from New Latin al. dehyd., abbr. for alcohol dehydrogenātum, dehydrogenized alcohol.

from Wiktionary, Creative Commons Attribution/Share-Alike License

A contraction of the Latin al(cohol) dehyd(rogenātum).


  • ALD-201 is a population of stem cells (ALDH (br) cells) produced using Aldagen's proprietary technology, which express high levels of an enzyme known as aldehyde dehydrogenase, or ALDH, and exhibit a variety of activities, that Aldagen believes may promote the regeneration of multiple types of cells and tissues.


  • It has been given that name, because it activates an enzyme called aldehyde dehydrogenase 2

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  • In the body, the aldehydes are broken down by a family of enzymes called aldehyde dehydrogenases.

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  • I did not wish to specify pure aldehyde, which is not very easily got or stored, and consequently I have had to determine a criterion as to when the proportion of reducing solution is properly adjusted.

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  • The research determined a protein called aldehyde dehydrogenase 1, or ALDH1, can be used to identify, isolate and track these ultra-resilient cells throughout the development of malignant colon or rectum disease.

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  • Moreover, the closest analysis fails to detect in the circulation any trace of the products of alcoholic combustion, such as aldehyde and acetic acid.

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  • During the reaction, large quantities of volatile oxidation products of alcohol, such as aldehyde, ethylic nitrate, &c., are evolved from the boiling liquid, whilst others, such as glycollic acid, remain in solution.

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  • These steps are catalysed be the enzymes alcohol dehydrogenase and aldehyde dehydrogenase respectively.

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  • This ability to attract electrons has earned cinnamic aldehyde its electrophile classification, but cinnamic aldehyde has mild or weak activity.

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  • An important study by Christopher Cabello and his colleagues at the Department of Pharmacology and Toxicology, College of Pharmacy, Arizona Cancer Center, University of Arizona, Tucson, concludes that cinnamic aldehyde shows exceptional promise in both the prevention and the treatment of melanoma.

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