1. A radioactive metallic element that is similar to tellurium and bismuth; occurs in uranium ores but can be produced by bombarding bismuth with neutrons in a nuclear reactor
   - polonium, Po

Type of: metal, metallic element

• armful
• armguard
• armhole
• armiger
• armigerous
• armilla
• Armillaria
• Armillaria caligata
• Armillaria ponderosa
• Armillaria zelleri
• Armillariella
• Armillariella mellea
• armillary
• armillary sphere
• Armin
• arming
• Arminian
• Arminian Baptist
• Arminian Church
• Arminianism
• Arminius
• armistice
• Armistice Day
• armless
• armlet