preheat
v. B1 Intermediate UK //pɹɪhˈiːt// pre·heat
v. to heat something to a specific temperature before you start using it. You usually do this for an oven or a pan before cooking.
v. to heat an appliance or container to a desired temperature before the actual cooking or processing begins. Often used in the context of kitchen appliances or industrial equipment.
You should preheat the oven for twenty minutes.
Before you start baking the cookies, make sure you preheat the oven to 180 degrees Celsius.
The laboratory protocol requires that the glassware be preheated to the same temperature as the liquid to prevent thermal shock and subsequent cracking.