Residue

The heavy, non-volatile components of crude oil that flow from the bottom of the fractionating column during fractional distillation.

Any organic matter left as residue, such as agricultural and forestry residue, including, but not limited to, conifer thinnings, dead and dying trees, commercial hardwood, noncommercial hardwoods and softwoods, chaparral, burn, mill, agricultural field, and industrial residues, and manure.