'azeotropic' originates from Modern Latin/French, specifically the noun 'azeotrope', where the prefix 'a-' (from Greek) meant 'not', Greek 'zeō' meant 'to boil', and Greek 'tropē' meant 'turning'.

'azeotropic' changed from the French/Modern Latin noun 'azeotrope' (coined in modern chemistry) and then formed into the English adjective 'azeotropic' by adding the suffix '-ic'.

Initially it referred to the property of 'not changing on boiling' (a constant boiling characteristic); over time it has come to mean 'pertaining to mixtures that boil without change in composition' in modern chemical usage.