1. Very hard mineral used as an abrasive
   - corundum

Type of: mineral

Part of: emery

• thermionic emission
• thermionic tube
• thermionic vacuum tube
• thermionic valve
• thermionics
• thermistor
• thermo-
• thermoacidophile
• thermobaric bomb
• Thermobia
• Thermobia domestica
• thermocautery
• thermochemical
• thermochemistry
• thermocline
• thermocoagulation
• thermocouple
• thermocouple junction
• thermodynamic
• thermodynamical
• thermodynamically
• thermodynamics
• thermodynamics of equilibrium
• thermoelectric
• thermoelectric thermometer