A2[I or T]to reach, or cause something to reach, the temperature at which a liquid starts to turn into a gas: Liquid nitrogen boils at a very low temperature.She scalded herself on some boiling water.If you give water to a small baby to drink, you have to boil it first.Physical and chemical processesHot and heatSultriness and humidityB1[I or T]to heat a container, especially one used for cooking, until the liquid in it starts to turn into a gas: Could you boil the kettle for me?The pan's boiling.Physical and chemical processesB1[T]to cook food by putting it in water that is boiling: I've boiled some potatoes for dinner.boiled carrotsPreparing food using heatPreparing foodboil dry›If a container or food boils dry, all the liquid in the container in which the food was cooking turns to gas.Preparing food using heatPreparing food›[T]to wash clothes in a container of very hot waterCleaning clothes