NOUN (1)

1. an alloy (usually of lead and tin) used when melted to join two metal surfaces;


VERB (1)

1. join or fuse with solder;
- Example: "solder these two pipes together"

The Collaborative International Dictionary of English v.0.48:

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]

The Collaborative International Dictionary of English v.0.48:

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]

WordNet (r) 3.0 (2006):

solder
    n 1: an alloy (usually of lead and tin) used when melted to join
         two metal surfaces
    v 1: join or fuse with solder; "solder these two pipes together"