Wiktionary
diethyl
n. (context organic chemistry English) Two ethyl groups attached to the same molecule.
WordNet
Wikipedia
Usage examples of "diethyl".
Aussie mozzie repellents include delightful ingredients like diethyl toluamide and bicyclo heptene dicarboximide.
Lyserge and Diethyl, or Big D and the Cube and the Hawk and the Blue Acid.