Ambrotype
Pronunciation : Am"bro*type
Part of Speech : n.
Etymology : [Gr. -type.] (Photog.)
Definition : Defn: A picture taken on a place of prepared glass, in which the lights are represented in silver, and the shades are produced by a dark background visible through the unsilvered portions of the glass.
Source : Webster's Unabridged Dictionary, 1913