n. Two ethyl groups attached to the same molecule.
The Century Dictionary and Cyclopedia
n. Same as butane.
n. A combining form used to indicate the presence of two ethyl radicals in the molecule of an organic compound.
Word Usage
"If you are exposed to a hazardous chemical such as diethyl phthalate, several factors will determine whether harmful health effects will occur and what the type and severity of those health effects will be."