soldering iron

noun
an instrument for melting and applying solder.

Origin:
1680–90

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
soldering iron
 
n
a hand tool consisting of a handle fixed to a copper tip that is heated, electrically or in a flame, and used to melt and apply solder

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Using an electric or butane soldering iron, solder connect the twisted joints.
Solder electrical connections, using soldering iron.
All solder connections shall be made with soldering iron and rosin core solder.
In one corner visitors can learn how to pick locks, in another how to use a
  soldering iron.
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