solder
noun [ U ] uk/ˈsəʊl.dər/ us/ˈsɑː.dɚ/
焊锡，焊料
a soft metal that is melted in order to join together pieces of metal so that they stick together when it cools and becomes hard again
solder
verb [ I or T ] uk/ˈsəʊl.dər/ us/ˈsɑː.dɚ/
焊接
to join pieces of metal together using solder