n.
Pronunciation: ' sä-d ə r, ' so ̇ -, Brit also ' säl-d ə r, ' s ō l-
Function: noun
Etymology: Middle English soudure, from Anglo-French, from souder to solder, from Latin solidare to make solid, from solidus solid
Date: 14th century
1 : a metal or metallic alloy used when melted to join metallic surfaces especially : an alloy of lead and tin so used
2 : something that unites