verb

(with reference to a liquid) reach or cause to reach the temperature at which it bubbles and turns to vapour.

we asked people to boil their drinking water

simmer,bubble,seethe,heat,cook,stew

noun

the temperature at which a liquid bubbles and turns to vapour.

bring the sauce to the boil and simmer for 10 minutes

boiling point,100 degrees Celsius/centigrade