parliamentarian

noun | \ ˌpär-lə-ˌmen-ˈtar-ē-ən, ˌpärl-yə-, -mən- \ | par·lia·men·tar·i·an

1. : an expert in the rules and usages of a parliament or other deliberative assembly; specifically, often capitalized : an officer of a legislative body acting as adviser on matters of procedure : an officer of a legislative body acting as adviser on matters of procedure

   Note: The parliamentarian of the U.S. House of Representatives is appointed by the Speaker of the House. The Secretary of the Senate appoints the Senate's parliamentarian with approval of the majority leader.

2. : a member of a parliament