noun. Ethanol produced by fermenting the sugars in biomass materials such as corn, sugar beets, switchgrass, or agricultural residues, used as a fuel in internal-combustion engines either in pure form or more often as a gasoline additive.

noun. Ethanol produced, by fermentation of crops, for use as a biofuel.

"The study shows that corn-based bioethanol, which is produced extensively in the US, has a higher combined environmental and health burden than conventional fuels."

bioethical