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 ]

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 ]

n. One who solders. [ 1913 Webster ]

a. & n. from Solder, v. t. [ 1913 Webster ]

Soldering iron,
Soldering tool, an instrument for soldering, consisting of a bit or bolt of copper having a pointed or wedge-shaped end, and furnished with a handle. [ 1913 Webster ]