pre·heat 
/ˌpri:ˈhi:t/ verb
pre·heats; pre·heat·ed; pre·heat·ing /ˌpri:ˈhi:t/ verb [+ obj] : to heat (an oven) to a particular temperature before putting food to be cooked inside
▪ Preheat the oven to 375 degrees before you put the roast in.
▪ Preheat the oven to 375 degrees before you put the roast in.
