Other forms: soldering, soldered, solders
To solder is to join wires with a melted alloy of low melting point. Solder the joint, a soldered connection, solder it on.
The l is silent in British English and sounded in American, which surprises everybody who meets it the other way. The parts themselves never melt, and flux is what lets the solder flow and stick.
1verbsolderTo join wires with a melted alloy of low melting point.
“He soldered the loose wire back onto the circuit board.”
solder is a joining.
Old French souder means to make solid, from Latin solidare, from solidus, solid.
Old French
soldure
Middle English
souder
English, today
solder
Built from
From Middle English souder, soudere, soudur, from Old French soldure, soudeure, from Old French souder, solder (“to solder”) (> Middle English souden (“to solder”)), from Latin solidō (“make solid”).
Etymology from Wiktionary, CC BY-SA