Definition of rotograph in English:

rotograph

noun

historical
  • A black and white photographic print in which positive and negative tones are reversed, formerly used especially for reproductions of manuscripts and the printed page.

Origin

Late 19th century; earliest use found in The Trade Marks Journal. From roto- + -graph, after photograph.

Pronunciation

rotograph

/ˈrəʊtə(ʊ)ɡrɑːf//ˈrəʊtə(ʊ)ɡraf/