'Solder' definitions:

Definition of 'solder'

From: WordNet
noun
An alloy (usually of lead and tin) used when melted to join two metal surfaces
verb
Join or fuse with solder; "solder these two pipes together"

Definition of 'Solder'

From: GCIDE
  • Solder \Sol"der\, n. [Formerly soder; F. soudure, OF. soudeure, fr. OF. & F. souder to solder, L. solidare to fasten, to make solid. See Solid, and cf. Sawder.] A metal or metallic alloy used when melted for uniting adjacent metallic edges or surfaces; a metallic cement. Hence, anything which unites or cements. [1913 Webster]
  • Hard solder, a solder which fuses only at a red heat, as one composed of zinc and copper, or silver and copper, etc.
  • Soft solder, a solder fusible at comparatively low temperatures; as, plumbers' solder, consisting of two parts lead and one part tin, is a soft solder. [1913 Webster]

Definition of 'Solder'

From: GCIDE
  • Solder \Sol"der\, v. t. [imp. & p. p. Soldered; p. pr. & vb. n. Soldering.] [Formerlysoder. See Solder, n.]
  • 1. To unite (metallic surfaces or edges) by the intervention of a more fusible metal or metallic alloy applied when melted; to join by means of metallic cement. [1913 Webster]
  • 2. To mend; to patch up. "To solder up a broken cause." --Hooker. [1913 Webster]