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)
to join (metal objects) with solder.
to join closely and intimately: two fates inseparably soldered by misfortune.
to mend; repair; patch up.
verb (used without object)
to unite things with solder.
to become soldered or united; grow together.

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

solderable, adjective
solderer, noun
solderless, adjective
desolder, verb (used with object)
resolder, verb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
solder (ˈsɒldə, US ˈsɒdər)
1.  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
2.  something that joins things together firmly; a bond
3.  to join or mend or be joined or mended with or as if with solder
[C14: via Old French from Latin solidāre to strengthen, from solidussolid]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

mid-14c., sawd, from O.Fr. soldure, from solder "to join with solder," from L. solidare "to make solid," from solidus "solid" (see solid). Modern form is from early 15c. The -l- is still pronounced in Great Britain. The noun is first attested late 14c.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The pair created this image by injecting molten solder into a tiny silicone
Deleading solder creates worries about electronics reliability.
Solder all the short leads in the columns together, down toward the empty space
  at the bottom of the board.
Solder is used to connect electric wires or other metal parts together.
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