Webster's Revised Unabridged Dictionary · 1913

Solder

Solder , noun

[Formerly soder; French soudure, Old French soudeure, from Old French & French souder to solder, Latin solidare to fasten, to make solid. See Solid, and compare Sawder.]

A metal or metallic alloy used when melted for uniting adjacent metallic edges or surfaces; a metallic cement.
anything which unites or cements.
Collocations (2)
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.

Solder , transitive verb

[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.
2.
To mend; to patch up.
To solder up a broken cause. — Hooker