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Reference.org
Aldehyde
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<p>In <a href="/facts/Organic_chemistry/djxhxaNg">organic chemistry</a>, an aldehyde (lat. <i>al</i>cohol <i>dehyd</i>rogenatum, <a href="/facts/Dehydrogenated/vwFAAqzp">dehydrogenated</a> <a href="/facts/Alcohol_(chemistry)/Y0SCTDkh">alcohol</a>) is an <a href="/facts/Organic_compound/gqCNaN45">organic compound</a> containing a <a href="/facts/Functional_group/GXkSPsjM">functional group</a> with the structure R−CH=O. The functional group itself (without the "R" <a href="/facts/Side_chain/Lw8KPAXn">side chain</a>) can be referred to as an aldehyde but can also be classified as a formyl group. Aldehydes are a common motif in many chemicals important in technology and biology. </p>