† deˈtithonize,v.Obs. [f. de- II. 1 + tithon-ic (f.Gr. τιθωνός, the spouse of Eos or Aurora) + -ize.] trans. To deprive (light) of actinic or chemical power. 1843Mech.Mag. XXXIX. 170 As if the light, being detithonized in passing through the larger mass, lost its energy in producing chemical action.