doubler

plural doublers

1. One who doubles.
2. An instrument for augmenting a very small quantity of electricity, so as to render it manifest by sparks or the electroscope.
3. structural engineeringA 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.

   The mechanics fastened a doubler over the hole where the cracked section of the plane's skin had been cut out.

   1 more example

   The airworthiness directive called for riveting a reinforcing doubler to the wing midspar web to keep the spar from buckling under flight loads.

4. Part of a distilling apparatus for intercepting the heavier fractions and returning them to be redistilled.
5. calico printingA blanket or felt placed between the fabric and the printing table or cylinder.
6. artsA person employed in a roller mill to fold the hot metal plates in half.
7. A device with two electrical plugs that plugs into an electrical outlet, effectively converting the electrical outlet into two; socket converter.
8. A diaper insert.

   Synonyms: diaper doubler

plural doublers

1. USdialectalA tenement house having two families on each floor.
2. colloquialA biplane aeroplane or kite.