ALDEHYDE • DICTIONARY ONE.COM • Definition of Aldehyde

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noun

Aldehyde n.

(Chem.) A colorless, mobile, and very volatile liquid obtained from alcohol by certain processes of oxidation.

(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. Note: The aldehydes are intermediate between the alcohols and acids, and differ from the alcohols in having two less hydrogen atoms in the molecule, as common aldehyde (called also acetaldehyde, acetic aldehyde or ethyl aldehyde), C2H4O; methyl aldehyde (called also formaldehyde), CH2O.

Aldehyde ammonia (Chem.), a compound formed by the union of aldehyde with ammonia.

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Etymology of 'Aldehyde'

Collaborative International Dictionary of English 0.48

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"Aldehyde" Quotes from Famous Books

... which arises in the mind of the writer is this:—'Is Salicylic Aldehyde "C6H4<COH orthohydroxybenzaldehyde" OH the cause of the ...

— Punch, or the London Charivari, Volume 158, April 21, 1920 • Various

... If, for example, a substance contains alkyl or hydroxyl groups, large quantities of the para compound are obtained, and very little of the ortho. The substitution takes place, however, almost entirely in the meta position, if a nitro, carboxyl, or aldehyde group be present. Ordinary phenol, C{6}H{5}.OH, gives para- and ortho-nitro-phenol; toluene gives para- and ortho-nitro-toluene; but nitro-benzene forms meta-di-nitro- benzene and benzoic ...

— Nitro-Explosives: A Practical Treatise • P. Gerald Sanford

... and, probably, a phenol, mentioned above, there may be recognized in ilang-ilang oil an aldehyde or ketone, inasmuch as upon shaking it with bisulphite of sodium I observed the formation of a very small quantity of crystals. That Gal did not obtain the like result must at present remain unexplained. Like the benzoic acid the acetic ...

— Scientific American Supplement, No. 288 - July 9, 1881 • Various

... to grief in dealing with experts. "Do you," asked one of a scientist, "know of a substance called Sulphonylic Diazotised Sesqui Oxide of Aldehyde?" and he looked round triumphantly. "Certainly," came the reply. "It is analogous in diatomic composition of Para Sulpho Benzine Azode Methyl Aniline in conjunction with Phehekatoline." Counsel said he would pursue the matter ...

— Law and Laughter • George Alexander Morton

... radicals with the formation of esters. The basicity of an organic acid, as above defined, is determined by the number of carboxyl groups present. Oxy-acids are carboxyllc acids which also contain a hydroxyl group; similarly we may have aldehyde-acids, ketone-acids, &c. Since the more important acids are treated under their own headings, or under substances closely allied to them, we shall here confine ourselves ...

— Project Gutenberg Encyclopedia