- aldehyde - any of a class of highly reactive chemical compounds; used in making resins and dyes and organic acids
--1 is a kind of organic compound
--1 has particulars:paraldehyde, ethanal trimer; acetaldehyde, ethanal; formaldehyde, methanal; furfural, furfuraldehyde; glyceraldehyde, glyceric aldehyde; propanal, propionaldehyde; propenal, acrolein