Definitions from Wiktionary (doubler)

▸ noun:  One who doubles.
▸ noun:  An instrument for augmenting a very small quantity of electricity, so as to render it manifest by sparks or the electroscope.
▸ noun:  (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.
▸ noun:  Part of a distilling apparatus for intercepting the heavier fractions and returning them to be redistilled.
▸ noun:  (calico printing) A blanket or felt placed between the fabric and the printing table or cylinder.
▸ noun:  (metalworking) A person employed in a roller mill to fold the hot metal plates in half.
▸ noun:  A device with two electrical plugs that plugs into an electrical outlet, effectively converting the electrical outlet into two; socket converter.
▸ noun:  A diaper insert.
▸ noun:  (US, dialect) A tenement house having two families on each floor.
▸ noun:  (colloquial) A biplane aeroplane or kite.

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