1. 
   Duograph
   Du'o·graph noun [ Latin duo two + -graph .] (Photo-engraving) 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.
   Found op http://www.encyclo.co.uk/webster/D/132
   
   
2. 
   Duograph
   • (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.
   Found op http://thinkexist.com/dictionary/meaning/duograph/
   
   

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