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Definition of solder noun from the Oxford Advanced Learner's Dictionary

solder

noun
 
/ˈsəʊldə(r)/,
 
/ˈsɒldə(r)/
 
/ˈsɑːdər/
[uncountable]
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  1. a mixture of metals that is heated and melted and then used to join metals, wires, etc. together
    Word OriginMiddle English: from Old French soudure, from the verb souder, from Latin solidare ‘fasten together’, from solidus ‘solid’.
See solder in the Oxford Advanced American Dictionary

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