Definition of "doubler"

One who doubles.  examples

An instrument for augmenting a very small quantity of electricity, so as to render it manifest by sparks or the electroscope.  examples

(structural engineering) A metal plate riveted or welded over a preexisting metal structural component to reinforce it and relieve the stress on the preexisting component, or to serve as a patch where part of the original structure has failed or been removed.  examples

Part of a distilling apparatus for intercepting the heavier fractions and returning them to be redistilled.  examples

(calico printing) A blanket or felt placed between the fabric and the printing table or cylinder.  examples

A person employed in a roller mill to fold the hot metal plates in half.  examples

A device with two electrical plugs that plugs into an electrical outlet, effectively converting the electrical outlet into two; socket converter.  examples

(US, dialect) A tenement house having two families on each floor.  examples

(colloquial) A biplane aeroplane or kite.  examples