noun \ˈal-də-ˌhīd\

Definition of ALDEHYDE

:  acetaldehyde; broadly :  any of a class of highly reactive organic compounds that are analogous to acetaldehyde and characterized by a carbonyl group attached to a hydrogen atom
al·de·hy·dic \ˌal-də-ˈhī-dik\ adjective

Origin of ALDEHYDE

German Aldehyd, from New Latin al. dehyd., abbreviation of alcohol dehydrogenatum dehydrogenated alcohol
First Known Use: 1833


noun \ˈal-də-ˌhīd\   (Medical Dictionary)

Medical Definition of ALDEHYDE

: acetaldehyde; broadly : any of various highly reactive compounds typified by acetaldehyde and characterized by the group CHO
al·de·hy·dic \ˌal-də-ˈhīd-ik\ adjective


noun    (Concise Encyclopedia)

Any of a class of organic compounds that contain a carbonyl group (CO; see functional group) in which the carbon atom is bonded to at least one hydrogen atom. Many have characteristic odours. Oxidation (see oxidation-reduction) of aldehydes yields acids; reduction produces alcohols. They participate in many chemical reactions and readily undergo polymerization into chains containing tens of thousands of the monomer molecule. The combination of aldehydes (e.g., formaldehyde) with other molecules results in several familiar plastics. Many aldehydes are large-scale industrial materials, useful as solvents, monomers, perfume ingredients, and intermediates. Many sugars are aldehydes, as are several natural and synthetic hormones and compounds such as retinal (a derivative of vitamin A, important in vision) and pyridoxal phosphate (a form of vitamin B).


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