solder
UK[ˈsəʊldə(r)]US[ˈsɑːdər]
v
To join two or more metal parts together by melting a soft metal alloy between them.
n
The soft metal alloy used to join other metals together.
Etymology
The word 'solder' entered English in the 14th century from the Old French 'soudure', a noun derived from the verb 'souder', meaning 'to consolidate or join'. This Old French term traces back to the Latin verb 'solidare', which means 'to make solid or firm', itself coming from the Latin adjective 'solidus' (solid). The fascinating semantic journey is from the general concept of making something firm and whole to the specific technical process of uniting metals. The silent 'l' in the modern English spelling is a direct, though now unpronounced, relic of its Latin root 'solidus', preserved to reflect its etymological origin.
Analysis
The word 'solder' is a simplex loanword. Its spelling and form were borrowed as a whole from Old French.
Examples
You need a hot iron to solder the wires to the circuit board.
This type of solder contains a mixture of tin and lead.
The jeweler will carefully solder the broken links of the chain.