Heat
To increase the temperature of ingredients, either to cook, eg heat the sauce until thickened or to make it more palatable, eg the heat the soup until piping hot.
Heatproof dish
A dish that can withstand high temperatures in the oven, heatproof dishes are usually glass or ceramic and are available in a wide variety of shapes and sizes. A heatproof dish is not necessarily flameproof.
Heatproof jug
A jug that can withstand boiling liquids, usually made from plastic or glass.