1. The bureau of the Treasury Department responsible for tax collections
   - Internal Revenue Service

1. A heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium
   - iridium, atomic number 77

1. A board of the British government that administers and collects major direct taxes
   - Inland Revenue [UK]

Type of: administrative body, administrative unit, agency, authority, bureau, federal agency, government agency, metal, metallic element, office

Part of: Department of the Treasury, Treasury, Treasury Department, United States Treasury

Encyclopedia: IR

• Megaera
• megaflop
• megagametophyte
• megahertz
• megahit
• megakaryocyte
• megakaryocytic
• megalith
• megalithic
• megalithic structure
• megalo-
• Megalobatrachus
• Megalobatrachus maximus
• megaloblast
• megaloblastic
• megaloblastic anaemia
• megaloblastic anemia
• megalocardia
• megalocephaly
• megalocyte
• megalohepatia
• megalomania
• megalomaniac
• megalomaniacal
• megalomanic