aldehyde

As a noun aldehyde

is aldehyde.

As an adjective undefined is

lacking a definition or value.

As nouns the difference between aldehyde and acetone

is that aldehyde is any of a large class of reactive organic compounds (R·CHO) having a carbonyl functional group attached to one hydrocarbon radical and a hydrogen atom while acetone is a colourless, volatile, flammable liquid ketone, (CH₃)₂CO, used as a solvent.

As a noun aldehyde is

aldehyde.

As nouns the difference between ester and aldehyde

is that ester is ester while aldehyde is aldehyde.

As nouns the difference between taxonomy and aldehyde

is that taxonomy is the science or the technique used to make a classification while aldehyde is aldehyde.

As nouns the difference between amide and aldehyde

is that amide is while aldehyde is aldehyde.

As nouns the difference between aldehyde and lophine

is that aldehyde is aldehyde while lophine is (organic compound) a nitrogenous organic base obtained by the oxidation of amarine, and regarded as a derivative of benzoic aldehyde.

As nouns the difference between aldehyde and paraconine

is that aldehyde is aldehyde while paraconine is (chemistry) a base resembling and isomeric with conine, obtained from butyric aldehyde and ammonia.