The Collaborative International Dictionary of English v.0.48:

Engrosser \En*gross"er\, n.
   1. One who copies a writing in large, fair characters.
      [1913 Webster]

   2. One who takes the whole; a person who purchases such
      quantities of articles in a market as to raise the price;
      a forestaller. --Locke.
      [1913 Webster]