Definition of solder in US English:



  • A low-melting alloy, especially one based on lead and tin or (for higher temperatures) on brass or silver, used for joining less fusible metals.

    ‘remove the fitting using a blowtorch to melt the solder’
    count noun ‘the Roman silversmith did indeed use several different solders’
    • ‘Occasionally, a pregnant woman is exposed to significant amounts of lead in her drinking water if her home has lead pipes, lead solder on copper pipes or brass faucets.’
    • ‘In many power devices handling large currents, high-melting-point solder containing lead is used internally to ensure high reliability.’
    • ‘Other potential sources of lead include fishing-line weights, metal weights in curtains, antique ceramics, leaded glass, and water from pipes with lead solder.’
    • ‘In Washington, the chloramines also caused lead to leach out of service lines, water meters, plumbing with lead solder and brass faucets that contain lead.’
    • ‘Replace lead pipes with copper, and use lead-free solder when installing or repairing plumbing.’
    • ‘Early food cans were sealed with thick seams of lead solder, which caused slight poisoning when they contained acidic foodstuffs.’
    • ‘The most important use of tin in the United States is the manufacture of solder, an alloy made of tin and lead.’
    • ‘The electronics industry utilizes hot gas soldering to reflow or melt solder in localized areas on circuit assemblies.’
    • ‘In the past, copper pipes were joined with lead based solder which is currently banned from usage.’
    • ‘There are 37 soldered fins on each side of the heatsink for a grand total of 74 copper fins connected to the copper base by means of solder.’
    • ‘Japanese manufacturers have vowed to remove lead from their solder by 2003 due to environmental and recycling concerns.’
    • ‘Many other homes in the city, however, have lead pipes, solder or leaded brass faucets which can also contribute to lead leaching.’
    • ‘Until their ban in 1991, lead pipes and solder commonly were used in home plumbing systems.’
    • ‘The key replacement for tin/lead solder is a tin/silver/copper alloy available exclusively from Japan.’
    • ‘Computer screens can contain up to eight pounds of lead, and the National Recycling Coalition says other electronic items can contain copper, lead solder, nickel, zinc, cadmium, mercury and PCBs.’
    • ‘The encasement design was elegantly simple: two sheets of glass with metallic copper flashed on the edges, joined with solder to a lead ribbon that sealed the three-eighths-inch gap between the glass.’
    • ‘Use of tin solder is growing in electronics, especially computer hardware, and modern laptop liquid crystal screens have a tin-oxide film for their panels.’
    • ‘The now familiar swinging ‘trapdoor’ breechblock was fitted and attached to the top of the barrel with a hinge secured by soft solder and a single screw.’
    • ‘Some alloys, like solder, which is usually 60% tin and 40% lead, are used to make electrical circuits.’
    • ‘The invention Intel is announcing does away with the top layer of the package and the bumps of solder by connecting copper wiring directly from the core of the package to the processor.’


[with object]
  • Join with solder.

    ‘the wires to this clip are soldered to the circuit board’
    ‘the soldered terminal joints’
    • ‘When some solder is applied to the pins previous to soldering the wires, the latter ones will connect more easy.’
    • ‘To prepare for the reinstallation, a traditional support system of saddle bars and copper tie wires were soldered onto each window panel.’
    • ‘Almost any method of joining is applicable to aluminum: riveting, welding, brazing or soldering.’
    • ‘The fire is believed to have happened when the plumber was soldering a water pipe and insulation in the cavity wall caught fire.’
    • ‘These joining methods may include welding, brazing, soldering, riveting, or bolting.’
    • ‘The coils are soldered in series, such that the current rotates in opposite directions, between the left and right signal-out wires.’
    • ‘The ordinary grades of wrought zinc can be soldered easily by conventional methods.’
    • ‘I have tied and soldered my own disc-brake mountain bike wheels for years now, and I notice a difference not only in lateral stiffness but especially in application of the disc brake.’
    • ‘She thinks that a view through an electron microscope should provide the answers by showing the places in which they were soldered, but as the Zlatinitsa treasure shows, one can never be sure.’
    • ‘The tape was soldered to the glass after the edge of the glass was coated with a film of copper to make it more receptive to the solder.’
    • ‘‘Yep,’ he said as he soldered a wire onto a circuit board that was attached to a box of gears.’
    • ‘Steph and Peter get down to the tricky business of soldering the widgets and gadgets that make up the complex technology inside the new digital studios.’
    • ‘Having undone the existing unit I discovered that the wires were soldered to the terminals.’
    • ‘Copper can also be welded, brazed and soldered satisfactorily.’
    • ‘I find the physical work of soldering the wiring to the keyboard encoder challenging, mostly due to the tight quarters.’
    • ‘I felt that a bond of trust was soldered between us.’
    • ‘Cut a small sliver of the silver solder for each joint to be soldered.’
    • ‘Applying the soldering iron to the wires where they are soldered to the Centronics connector and pulling gently should be enough to undo the wires from the unwanted connector.’
    • ‘He said the technicians needed a week to repair the leaking pipe because they had to block it first from water inundation before soldering the leakages.’
    • ‘In addition, they can be joined by brazing and soldering.’
    attach, join, fasten, fix, affix, couple, link, bridge, secure, make fast, tie, tie up, bind, fetter, strap, rope, tether, truss, lash, hitch, moor, anchor, yoke, chain
    View synonyms


Middle English: from Old French soudure, from the verb souder, from Latin solidare ‘fasten together’, from solidus ‘solid’.