Definition of tithonization in English:

tithonization

Pronunciation /ˌtɪθənʌɪˈzeɪʃn/ /ˌtʌɪθənʌɪˈzeɪʃn/

noun

rare, historical Photography
  • In the terminology of John William Draper: the photochemical changes caused by exposure to tithonic rays, especially those on a photographic plate.

Origin

Mid 19th century; earliest use found in John William Draper (1811–1882), chemist and historian. From tithonize + -ation.