GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Doubler (?), n.
   1. One who, or that which, doubles.
   
   [1913 Webster]
   
   
   2. (Elec.) An instrument for augmenting a very small quantity of electricity, so as to render it manifest by sparks or the electroscope.
   
   [1913 Webster]
   
   
   3. A part of a distilling apparatus for intercepting the heavier fractions and returning them to be redistilled.
   
   [Webster 1913 Suppl.]
   
   
   4.  (Calico Printing) A blanket or felt placed between the fabric and the printing table or cylinder.
   
   [Webster 1913 Suppl.]