Etymograph

English

aldehydic acid

From aldehyde + -ic + acid.

Formed from aldehyde + -ic + acid

Proto-Indo-European *wed- ‘water’

Proto-Indo-European *wódr̥ ‘water’

Proto-Hellenic *údōr ‘water’

Ancient Greek ῡ̆̔́δωρ ‘water’

German Aldehyd

English aldehyde

Proto-Indo-European *h₂eḱ- ‘sharp’

…

Proto-Italic *akēō

Latin aceō ‘to be sour’

Latin acidus ‘sour’

French acide ‘acid’

English acid

Today it means

noun dicarboxylic acid with one carboxy group replaced by an aldehyde group

Language periods are conventional ranges, not dates for this word.

Etymograph / aldehydic acid