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

• acidulent
• acidulous
• acidulousness
• aciduric
• acinar
• acinic
• Acinonyx
• Acinonyx jubatus
• Acinos
• Acinos arvensis
• acinose
• acinous
• acinus
• Acipenser
• Acipenser huso
• Acipenser transmontanus
• Acipenseridae
• ack-ack
• ack-ack gun
• ackee
• acknowledge
• acknowledgeable
• acknowledged
• acknowledgement
• acknowledgment