Aldehyd

{alf -de-Jiid ) [al, the first syllable of alcohol; dehyd, from dehydrates]. I. A cla 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. They contain the group COH. 2. C2H40. Alcohol deprived of two atoms of hydrogen, or acetic aldehyd. It is a colorle , limpid liquid, with a characteristic odor. A., Anisic, C8H802, results on oxidizing various e ential oils (anise, fennel, etc.,) with dilute HN03. A., Benzoic, C7H60. Benzaldehyd, the oil of bitter almonds. A., Cinnamic, C9H80, the chief ingredient of the e ential oil of cinnamon and ca ia. A., Formic, CH20, Formaldehyde is said to be microbic i dal and antiseptic. See Formaldehyd. 42