LATIN DICTIONARYLexicon Latīnum
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“solder” in Latin

The English word solder itself goes back to Latin solidō.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

solder s.
ferrumen (Plin.). “Soft solder” (Sam Slick), palpum (e.g., mihi obtrudere non potes palpum, Plaut., Pseud., 4, 1, 35).
solder v.
ferruminare: conferruminare (to solder together, Plin.).

Quick answer

What is the Latin word for solder?
The usual Latin words for “solder” are ferrūmen, palpus, ferrūminō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.