1. thorium dioxide, a white crystalline compound used in gas mantles and as a refractory material
Usage: chemistry

Examples

• Thoria was commonly used in gas lamp mantles in the early 20th century.
• The refractory properties of thoria make it useful in high-temperature applications.
• Scientists studied the radioactive properties of thoria compounds.
• Thoria has a very high melting point of over 3000 degrees Celsius.
• The production of thoria requires careful handling due to thorium’s radioactivity.