I. ˈd(y)üəˌtōn adjective
or duo·toned -nd
Etymology: duo- + tone or -toned
: having or yielding two tones or colors
II. noun
( -s )
: a process for making prints typically in two shades of the same color or in black and one tint by the use of two halftone plates made with the screen set at two different angles
duotone plates
duotone illustrations
also : a print made by this process