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solder

[ sod-er ]
/ ˈsɒd ər /
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noun

any of various alloys fused and applied to the joint between metal objects to unite them without heating the objects to the melting point.
anything that joins or unites: the solder of their common cause.

verb (used with object)

verb (used without object)

to unite things with solder.
to become soldered or united; grow together.

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Origin of solder

1325–75; (noun) Middle English soudour<Old French soudure, soldure, derivative of solder to solder <Latin solidāre to make solid, equivalent to solid(us) solid + -āre infinitive suffix; (v.) late Middle English, derivative of the noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for solder

solder
/ (ˈsɒldə, US ˈsɒdər) /

noun

an alloy for joining two metal surfaces by melting the alloy so that it forms a thin layer between the surfaces. Soft solders are alloys of lead and tin; brazing solders are alloys of copper and zinc
something that joins things together firmly; a bond

verb

to join or mend or be joined or mended with or as if with solder
solderable, adjectivesolderer, noun
C14: via Old French from Latin solidāre to strengthen, from solidus solid
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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