1. A soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands
   - thorium, atomic number 90 
2. The fifth day of the week; the fourth working day
   - Thursday

Type of: metal, metallic element, weekday

Part of: monazite, thorite

Encyclopedia: Th

• metallic element
• metallic-colored
• metallic-coloured
• metallic-looking
• metalliferous
• metallike
• metallise
• metallised dye
• metallize
• metallized dye
• metallographic
• metallography
• metalloid
• metallurgic
• metallurgical
• metallurgical engineer
• metallurgist
• metallurgy
• metalware
• metalwork
• metalworker
• metalworking
• metalworking vise
• metalworks
• metamathematics