Bible Dictionaries
Duograph

Webster's Dictionary

(n.) A picture printed from two half-tone plates made with the screen set at different angles, and usually printed in two shades of the same color or in black and one tint.

Bibliography Information
Webster, Noah. Entry for 'Duograph'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​d/duograph.html. 1828.