1. An intensely radioactive metallic element that occurs in minute amounts in uranium ores
   - Ra, atomic number 88

Derived forms: radiums

Type of: metal, metallic element

Part of: uranium ore

Encyclopedia: Radium, CO Radium, BC Radium Radium, Kansas Radium, KS Radium, Colorado

• Caryocar
• Caryocar nuciferum
• Caryocaraceae
• Caryophyllaceae
• caryophyllaceous
• caryophyllaceous plant
• Caryophyllales
• Caryophyllidae
• caryophylloid dicot family
• caryophylloid dicot genus
• caryopsis
• Caryota
• Caryota urens
• casaba
• casaba melon
• Casablanca
• Casals
• Casanova
• Casanova de Seingalt
• casava
• casbah
• cascabel
• cascade
• cascade down
• cascade everlasting