'aniline-immiscible' is a compound of 'aniline' and 'immiscible'. 'aniline' originates from French/Scientific Latin (from Portuguese 'anil' and Arabic 'an-nīl') referring to the indigo plant and the dye; 'immiscible' derives from Latin 'in-' (not) + 'miscere' (to mix).

'aniline' entered chemical nomenclature in the 19th century from French/Latin usage for the compound C6H5NH2; 'immiscible' developed from Latin 'miscibilis' > Medieval/Modern Latin > English 'miscible', with the negative prefix 'in-' forming 'immiscible'. The compound form combines the modern names into a descriptive adjective.

Initially 'aniline' referred more generally to substances related to indigo dye; over time it narrowed to the specific aromatic amine 'aniline'. 'immiscible' has retained the meaning 'not able to mix', and the compound means 'not able to mix with aniline'.