From Longman Dictionary of Contemporary Englishpreheatpre‧heat /ˌpriːˈhiːt/ verb [transitive] DFCto heat an oven to a particular temperature before it is used to cook something Preheat the oven to 375 degrees.→ See Verb table
Examples from the Corpus
preheat• Place in preheated 142 oven until skin is wrinkled and flesh is soft, 45 to 50 minutes.• Put a cookie sheet on the oven rack during preheating.• Light a hot fire in a charcoal grill or preheat a gas grill to medium high.• About 15 minutes before serving, preheat oven to 350 F.. Prepare an aromatic fire in a charcoal grill.• To prepare nuts, preheat oven to 400 F.. Bring water to a boil.• Prepare a fire in a charcoal grill, preheat oven to 450 F. or preheat broiler.• Prepare a grill or preheat the broiler.Preheat ... oven• Refrigerate at least 90 minutes or overnight if covered with plastic wrap. Preheat the oven to 325 degrees.• For the cake: Spray a 9-inch tube pan with the nonstick spray. Preheat the oven to 350 degrees. 