LEARNit Dictionary
founder member
noun
/ˌfaʊndə ˈmembə(r)/
UK
/ˌfaʊndər ˈmembər/
US
1
one of the first members of a society, an organization, etc., especially one who helped start it
عضو بنیانگذار, عضو مؤسس, عضو موسس