NCIt definition : Any organic compound containing a formyl (-CHO) group. Its functional group, with
the structure R-CHO, consists of a carbonyl center bonded to hydrogen and an R group.
Traces of various aldehydes are found in essential oils and often contribute to their
odors.;
Alternative definition : NCI-GLOSS: A type of chemical substance made from alcohol. Aldehydes are found in
essential oils (scented liquid taken from plants).;