• WordNet 3.6
    • n aldehyde any of a class of highly reactive chemical compounds; used in making resins and dyes and organic acids
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Webster's Revised Unabridged Dictionary
    • Aldehyde (Chem) A colorless, mobile, and very volatile liquid obtained from alcohol by certain processes of oxidation.
    • Aldehyde (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.
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Century Dictionary and Cyclopedia
    • n aldehyde A transparent colorless liquid, CH3COH, of pungent suffocating odor, produced by the oxidation of ordinary alcohol. When exposed to the air or to oxygen it is converted into acetic acid. Distinctively called acetic aldehyde and ethaldehyde.
    • n aldehyde 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.
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Chambers's Twentieth Century Dictionary
    • n Aldehyde al′dē-hīd a volatile fluid with a suffocating smell, obtained by the oxidation of alcohol: a large class of compounds intermediate between alcohols and acids.
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Webster's Revised Unabridged Dictionary
Abbrev. fr. al,cohol dehyd,rogenatum, alcohol deprived of its hydrogen
Chambers's Twentieth Century Dictionary
From Al. dehyd., a contr. for Alcohol dehydrogenatum.


In literature:

ALDEHYDE, a limpid, very volatile liquid, of a suffocating odour, obtained from the oxidation of alcohol.
"The Nuttall Encyclopaedia" by Edited by Rev. James Wood
Aldehyde is formed to a considerable extent during the reaction.
"Scientific American Supplement, No. 832, December 12, 1891" by Various
Geraniol by oxidation goes into the aldehyde, citral, which occurs in lemons, oranges and verbena flowers.
"Creative Chemistry" by Edwin E. Slosson
With dilute sulphuric acid and bichromate of potassium turns green, and evolves aldehyde.
"Aids to Forensic Medicine and Toxicology" by W. G. Aitchison Robertson
The resulting compounds are known as aldehydes.
"An Elementary Study of Chemistry" by William McPherson
The value of the oil depends upon its aldehyde content, the chief constituent being cinnamic aldehyde.
"The Handbook of Soap Manufacture" by W. H. Simmons
An oxycellulose resulted possessing strongly marked aldehydic characteristics.
"Researches on Cellulose" by C. F. Cross
The aldehyde is best made as required.
"On Laboratory Arts" by Richard Threlfall
Violet or red colour = aldehyde.
"The Elements of Bacteriological Technique" by John William Henry Eyre
Thio-aldehydes, thio-ketones and thio-acids also exist.
"Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1" by Various
An ammoniacal solution of silver nitrate is reduced by chloral; and nascent hydrogen converts it into aldehyde.
"Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 3" by Various
Among the first class, aerial or gaseous disinfectants, formic aldehyde has of late years taken foremost place.
"Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 5" by Various
They yield from 3 to 6% of a volatile oil, the chief constituent of which is cymene aldehyde.
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 3" by Various
By this means the first compound is transformed into benzoic aldehyde, and the second into benzoic acid.
"Coal" by Raphael Meldola
From this formic aldehyde, or formol, we may obtain all the various carbohydrates by simple polymerization, i.e.
"The Mechanism of Life" by Stéphane Leduc
The aldehyde has been spoken of as the co-enzyme.
"The Nature of Animal Light" by E. Newton Harvey
The aldehydes and ketones provided material for his earlier work.
"Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 4" by Various
C6H12O6; it may be regarded as the aldehyde of sorbite.
"Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 2" by Various
The third step is the introduction of side chains into polyglycine by the reaction with aldehydes or with unsaturated hydrocarbons.
"Significant Achievements in Space Bioscience 1958-1964" by National Aeronautics and Space Administration
With aldehydes and ketones it forms oximes (q.v.).
"Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 2" by Various

In news:

The catalysts work by binding ethanol and butanol and converting them to aldehydes, which react with acetone to add more carbon atoms, producing longer hydrocarbons.

In science:

The oxygen is present in aldehydes and carboxylic acids, carbon oxides and of course, water.
Cosmic Dust in the 21st Century
Most of the hydrocarbons are unsaturated and the aldehydes may polymerize to form sugars given the right conditions.
Cosmic Dust in the 21st Century
In a standard analytical 2D gel loaded with 50-100µg of protein, the first major spots should begin to appear within 1 minute. Delayed appearance indicates lower than expected sensitivity, but is observed when aldehydes have not been used in the fixing process.
Silver Staining of Proteins in 2DE Gels
The gels are then stained by different silver staining methods described in the chapter. A: ultrafast method; B: fast silver nitrate; C: long silver nitrate; D: Ammoniacal silver without aldehyde fixation; E: Ammoniacal silver with formaldehyde fixation.
Silver Staining of Proteins in 2DE Gels
Polycarboxylate-coated and surfactant-free white aldehyde/amidine-coated microspheres were purchased respectively from Polysciences (Warrington, PA) and Interfacial Dynamics (Tualatin, OR), and kept in the refrigerator until diluted for use in the experiments.
Long-range forces extending from polymer-gel surfaces