/ ˈsəʊldə(r); ˈsɒldə(r); NAmE ˈsɑːdər/ noun , verb
■ noun
[ U ] a mixture of metals that is heated and melted and then used to join metals, wires, etc. together
■ verb
[ vn ] solder sth (to / onto sth) | solder (A and B together) to join pieces of metal or wire with solder
••
WORD ORIGIN
Middle English : from Old French soudure , from the verb souder , from Latin solidare fasten together, from solidus solid.