Word Origin & History
lilac1625, from Fr. lilac "shrub of genus Syringa with mauve flowers," from Sp. lilac, from Arabic lilak, from Pers. lilak, variant of nilak "bluish," from nil "indigo" (cf. Skt. nilah "dark blue"), of unknown origin. As a color name, attested from 1791; as a scent, from 1895.