1. Any of various fusible alloys, usually tin and lead, used to join metallic parts.
2. Something that joins or cements.
v. sol·dered, sol·der·ing, sol·ders
1. To unite or repair (parts, for example) with solder.
2. To join or unite: The agreement soldered the factions into an alliance.
1. To unite or repair something with solder.
2. To be joined or united.
[Middle English soudur, from Old French soudure, soldure, from souder, soulder, to solder, from Latin solidāre, to make solid, from solidus, solid; see SOLID.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2019 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.