illume /ɪˈluːm/noun 1verb 1forms 3 noun1 •(literary, no longer used) Illumination.Till lo! at once broad through the gloom, / The lightnings flash’d their dread illume, / Full on a rock by copse embound, / And tore and whirl’d its ruins round; […] — 1838 verb1 •(literary, no longer used) To throw or spread light upon; to make light or bright.How dread the thunder's peal that rolls above ! How bright the flashes that illume the sky ! — 1819 formsillumed · illuming · illumes