sol·​der | \ ˈsä-dər How to pronounce solder (audio) , ˈsȯ-, British also ˈsäl-də, ˈsōl-\

Definition of solder

 (Entry 1 of 2)

1 : a metal or metallic alloy used when melted to join metallic surfaces especially : an alloy of lead and tin so used
2 : something that unites


soldered; soldering\ ˈsä-​d(ə-​)riŋ How to pronounce soldering (audio) , ˈsȯ-​ , British also  ˈsäl-​ , ˈsōl-​ \

Definition of solder (Entry 2 of 2)

transitive verb

1 : to unite or make whole by solder
2 : to bring into or restore to firm union a friendship soldered by common interests

intransitive verb

1 : to use solder
2 : to become united or repaired by or as if by solder

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Other Words from solder


solderability \ ˌsä-​də-​rə-​ˈbi-​lə-​tē How to pronounce solderability (audio) , ˌsȯ-​ \ noun
solderer \ ˈsä-​dər-​ər How to pronounce solderer (audio) , ˈsȯ-​ \ noun

Examples of solder in a Sentence


Wires are soldered onto the circuit board.

Recent Examples on the Web: Noun

New York Gold beater’s block, repoussé hammer, solder pick, bezel pusher, burnishers, pliers, the torch and the kiln. Laura Jacobs, WSJ, "‘A View From the Jeweler’s Bench’ Review: A Glittering Education," 27 Feb. 2019 In the aftermath, Falcon 7Xs were grounded around the world until officials were able to trace the source of the problem: a bad solder joint that caused a control unit to transmit erroneous signals. Jeff Wise, Popular Mechanics, "4 Times Before the Boeing 737 Max 8 That Plane Automation Software Went Haywire," 18 Mar. 2019 This move will be popular among overclockers, as the better thermal conductivity of solder generally enables reduced temperatures and higher overclocking potential. Peter Bright, Ars Technica, "Intel goes up to 8 cores for mainstream chips, with a 28 core overclockable Xeon," 8 Oct. 2018 As soon as the flux disappears, touch the top of the joint with some solder. Steve Willson, Popular Mechanics, "How To Install An Electric Water Heater," 24 Aug. 2018 Without it, water can leach heavy metals from pipes, solder, and other parts of an aging water system, carrying it directly to the faucets of the customers. Molly Rauch, Good Housekeeping, "When Your Water Poisons Your Children," 16 Feb. 2016 Intel is also adding solder TIM for additional overclocking headroom. Mark Hachman, PCWorld, "Intel debuts 9th-generation Core chips, including Core i9 and X-series parts, with a few twists," 8 Oct. 2018 And, of course, through older water systems, which can have lead pipes or use pipe solder that contains lead. Molly Rauch, Good Housekeeping, "When Your Water Poisons Your Children," 16 Feb. 2016 Lead, used in water pipes until 1950 in Milwaukee and in the solder connecting copper piping until the 1980s, can flake into drinking water. Ahmed Elbenni, Milwaukee Journal Sentinel, "Mayor Tom Barrett has nominated a new Health Department commissioner. Here are the problems facing the agency," 12 July 2018

Recent Examples on the Web: Verb

With the newest Mac mini, gone is the two-core, four-thread 28W Haswell processor with up to 16GB soldered RAM. Peter Bright, Ars Technica, "Mac mini review—a testament to Apple’s stubbornness," 23 Nov. 2018 For example, on a visit to the Titan crane, one will see the original anchor, weighing 2500kg, with a Nazi Swastika soldered into the iron handle, and a visit to the control room reveals that A/C was only just added within the last few years. Tom Fowlks, Popular Mechanics, "The Floating Crane That Went From Tending Nazi U-Boats To Fixing the Panama Canal," 1 Aug. 2018 The official said authorities had recovered soldering equipment, a printer, and stamps similar to those used on the package bombs after arresting Sayoc last week in Florida. Michael Balsamo, The Seattle Times, "Official: Pipe-bomb suspect had hit list of targets," 30 Oct. 2018 Inside the van, investigators found soldering equipment, which is typically used to weld pieces of metal together, law-enforcement officials said. Arian Campo-flores, WSJ, "Mail Bomb Suspect Sayoc Appears in Court After New Package Found in Atlanta," 29 Oct. 2018 The tiny, reprogrammable SIM card—at just 6 millimeters by 5 millimeters—is soldered onto the iPhone's motherboard directly. Cyrus Farivar, Ars Technica, "Hello eSIM: Apple moves the iPhone away from physical SIMs," 12 Sep. 2018 Cut the relief valve tube to length and solder a male adapter to one end. Steve Willson, Popular Mechanics, "How To Install An Electric Water Heater," 24 Aug. 2018 McKinney even taught herself soldering for more complex costumes. Eder Campuzano,, "More than a costume: Portland cosplayers say suiting up is a labor of love," 10 Apr. 2018 His father worked in landscaping; his mother soldered computer chips. Steve Miletich, The Seattle Times, "‘He’s just a doer’: Meet Seattle police-chief candidate Ely Reyes," 9 July 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'solder.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of solder


14th century, in the meaning defined at sense 1


15th century, in the meaning defined at transitive sense 1

History and Etymology for solder


Middle English soudure, from Anglo-French, from souder to solder, from Latin solidare to make solid, from solidus solid

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Statistics for solder

Last Updated

27 Apr 2019

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Time Traveler for solder

The first known use of solder was in the 14th century

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More Definitions for solder



English Language Learners Definition of solder

 (Entry 1 of 2)

: a mixture of metals (such as lead and tin) that is melted and used to join metal parts together



English Language Learners Definition of solder (Entry 2 of 2)

: to join (something made of metal) to something else with solder


sol·​der | \ ˈsä-dər How to pronounce solder (audio) \

Kids Definition of solder

 (Entry 1 of 2)

: a metal or a mixture of metals used when melted to join or repair surfaces of metal


soldered; soldering

Kids Definition of solder (Entry 2 of 2)

: to join together or repair with solder

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More from Merriam-Webster on solder

Rhyming Dictionary: Words that rhyme with solder

Spanish Central: Translation of solder

Nglish: Translation of solder for Spanish Speakers Encyclopedia article about solder

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