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any of a class of organic compounds containing the group −CHO, which yields acids when oxidized and alcohols when reduced.
Historical Examples

Geraniol by oxidation goes into the aldehyde, citral, which occurs in lemons, oranges and verbena flowers.
Creative Chemistry Edwin E. Slosson

Benzoic acid, like the aldehyde, is a natural product which has long been known.
Coal Raphael Meldola

It is not possible to obtain the aldehyde in a pure condition, since it readily polymerizes.
Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 6 Various

There is no reduction unless an aldehyde is added or unless some boiled extract of a tissue such as liver is added.
The Nature of Animal Light E. Newton Harvey

But this interpretation ignores a number of other probable sources of the aldehyde.
Researches on Cellulose C. F. Cross

There is no reduction if the milk, methylene blue, and aldehyde are agitated with air.
The Nature of Animal Light E. Newton Harvey

The value of the oil depends upon its aldehyde content, the chief constituent being cinnamic aldehyde.
The Handbook of Soap Manufacture W. H. Simmons

By the addition of diluted sulphuric acid, the aldehyde of cinnamic acid is afterwards procured pure.
The Art of Perfumery G. W. Septimus Piesse

aldehyde is formed to a considerable extent during the reaction.
Scientific American Supplement, No. 832, December 12, 1891 Various

aldehyde gives a carmine red unaltered by ammonium sulphate.
The Elements of Bacteriological Technique John William Henry Eyre

noun
any organic compound containing the group -CHO. Aldehydes are oxidized to carboxylic acids and take part in many addition reactions
(modifier) consisting of, containing, or concerned with the group -CHO: aldehyde group or radical
n.

first oxidation product of alcohol, 1833, discovered in 1774 by German-born Swedish chemist Carl Wilhelm Scheele (1742-1786), the name said to have been coined by German chemist Justus von Liebig (1803-1873) from abbreviation of Modern Latin alcohol dehydrogenatum “dehydrogenated alcohol.”

aldehyde al·de·hyde (āl’də-hīd’)
n.

Any of a class of 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.

See acetaldehyde.

aldehyde
(āl’də-hīd’)
Any of a class of highly reactive organic compounds obtained by oxidation of certain alcohols and containing the group CHO. Aldehydes are used in manufacturing resins, dyes, and organic acids.