Webster's English Dictionary

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solder

1. sol.der \'sa:d-*r, 'so.d-\ n [ME soudure, fr. MF, fr. souder to solder, 
   fr. L solidare to]make solid, fr. solidus solid 1: a metal or metallic 
   alloy used when melted to join metallic surfaces; Xesp : an alloy of lead 
   and tin so used 2: something that unites or cements 
2. solder \-(*-)rin\ \-*r-*r\ vb or sol.der.ing 1: to unite or make whole 
   by solder  2: to bring into or restore to firm union  1: to use solder  2: 
   to become united or repaired by or as if by solder  - sol.der.er n