verb (used with object)
to heat before using or before subjecting to some further process: to preheat an oven before baking a cake.

1895–1900; pre- + heat

preheater, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
preheat (priːˈhiːt)
to heat (an oven, grill, pan, etc) beforehand

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Preheat the oven only long enough to reach the target temperature.
The trend has been for longer furnaces having lower flue gas temperatures and increased combustion air preheat.
Letting the oven preheat excessively wastes gas, since no food is cooked.
When pineapple has finished cooking, preheat broiler.
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