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An aqueous solution of formaldehyde, used as a preservative in museums and as a disinfectant.

A univalent radical, H.C:O, regarded as the essential residue of formic acid and aldehyde.

of a pleasant odor, obtained by the distillation of bran, sugar, etc., and regarded as an aldehyde derivative of furfuran; -- called also furfural.

of dilute acids and alkalies, always break down into some characteristic substance (acid, aldehyde, alcohol, phenole, or alkaloid) and glucose (or some other sugar); hence the name. They are of the nature of complex and compound ethers, and ethereal salts of the sugar carbohydrates.

m three to nine atoms of carbon in the molecules and having the constitution either of an aldehyde alcohol or of a ketone alcohol. Most glycoses have hydrogen and oxygen present in the proportion to form water, while the number of carbon atoms is usually equal to the number of atoms of oxygen.

deliquescent powder, (CO.H)2, obtained by the partial oxidation of glycol. It is a double aldehyde, between glycol and oxalic acid.

Pertaining to, or designating, an aldehyde acid, intermediate between glycol and oxalic acid. [Written also glyoxylic.]

d for dyeing silk, wool, and mordanted vegetable fiber a brilliant green; - - called also aldehyde green, acid green, malachite green, Victoria green, solid green, etc. It is usually found as a double chloride, with zinc chloride, or as an oxalate. (b) See Paris green (below). -- Gaignet's green (Chem.) a green pigmen…

tance, or of the analogous members of different series; as, ethane, ethyl alcohol, acetic aldehyde, and acetic acid are in heterology with each other, though each in at the same time a member of a distinct homologous series. Cf. Homology.

One of a group of crystalline bodies produced by the action of ammonia on certain aldehydes.

One of a large class of organic substances resembling the aldehydes, obtained by the distillation of certain salts of organic acids and consisting of carbonyl (CO) united with two hydrocarbon radicals. In general the ketones are colorless volatile liquids having a pungent ethereal odor.

rganic base obtained by the oxidation of amarine, and regarded as a derivative of benzoic aldehyde. It is obtained in long white crystalline tufts, -- whence its name.

Pertaining to an acid first obtained from benzoic aldehyde (oil of better almonds), as a white crystalline substance; -- called also phenyl glycolic acid.

Any one of a series of compounds of mercaptans with aldehydes.

Other; duplicate, corresponding to; resembling; hence, metameric; as, meta-arabinic, metaldehyde.

The monosaccharides are all open-chain compounds containing hydroxyl groups and either an aldehyde group or a ketone group.

An oily substance obtained by the distillation of castor oil, recognized as the aldehyde of oenanthylic acid, and hence called also oenanthaldehyde.

ydrogen from (anything), as by the action of oxygen; as, to oxidize alcohol so as to form aldehyde.

One of a series of isonitroso derivatives obtained by the action of hydroxylamine on aldehydes or ketones.

Formic aldehyde, regarded as a methylene derivative.