GNU Collaborative International Dictionary of English

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  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.

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