Electrofuge

In chemistry, an electrofuge is a leaving group that does not retain the lone pair of electrons from its previous bond with another species. It can result from the heterolytic breaking of covalent bonds. After this reaction an electrofuge may possess either a positive or a neutral charge; this is governed by the nature of the specific reaction.
An example would be the loss of from a molecule of benzene during nitration.
The word 'electrofuge' is frequently found in older literature, but its use in contemporary organic chemistry is now uncommon.