Definition of "unburned" []

• Not burned. (adjective)

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• "Smog has two main building blocks: hydrocarbons, such as unburned gasoline, and nitrogen oxides, or NOx, which are formed when hydrocarbons burn."
• "Unlike other exhaust byproducts of internal combustion (such as unburned hydrocarbons) which can be reduced by making an engine run more efficiently, there is only one way to reduce the output of C02 -- burn less fuel."
• "Winds died down overnight, allowing crews to burn 30 miles of containment lines between active and unburned areas that create a buffer from the most violent wind-driven runs."