boil definition

1. a painful sore with a hard core filled with pus
2. the temperature at which a liquid boils at sea level
• examples: they brought the water to a boil
3. come to the boiling point and change from a liquid to vapor
• examples: Water boils at 100 degrees Celsius
4. immerse or be immersed in a boiling liquid, often for cooking purposes
• examples: boil potatoes
• examples: boil wool
5. bring to, or maintain at, the boiling point
• examples: boil this liquid until it evaporates