Definitions for calotype
Origin: From κάλο, "good", and τύπος, "impression".
a method of taking photographic pictures, on paper sensitized with iodide of silver; -- also called Talbotype, from the inventor, Mr. Fox. Talbot
The Nuttall Encyclopedia
a process of photography invented by Fox Talbot in 1840, by means of the action of light on nitrate of silver.