·noun One who, or that which, doubles.
II. Doubler ·add. ·noun A blanket or felt placed between the fabric and the printing table or cylinder.
III. Doubler ·noun An instrument for augmenting a very small quantity of electricity, so as to render it manifest by sparks or the electroscope.
IV. Doubler ·add. ·noun A part of a distilling apparatus for intercepting the heavier fractions and returning them to be redistilled.