regula /regˈū-lə/

1. The rule of a religious order
2. A fillet, esp under the Doric taenia, below each triglyph (architecture)

• thiophens
• thiophil
• thio-salt
• thio-salts
• thiosulphate
• thiosulphates
• thiosulphuric acid
• thiouracil
• thiouracils
• thiourea
• thioureas
• thir
• thiram
• thirams
• third
• Third Age
• Third-Ager
• thirdborough
• thirdboroughs
• third class
• third-class
• third classes
• third degree
• third degree burn
• third degree murder