Definition of thorough light in English:

thorough light

noun

rare
  • In singular and plural Light that passes through or reveals something. Chiefly figurative and in figurative contexts with reference to the light of knowledge or discovery.

Origin

Late 16th century; earliest use found in John Florio (1553–1625), author and teacher of languages. In some forms from through- + light.

Pronunciation

thorough light

/ˈθʌrə lʌɪt/