I've read a number of older books in which I see the work "employé" being used where we would today use "employee". The meaning in all cases was obvious.
Example:
"You seem most fortunate in having an employé who comes under the full market price."
(Source: "The Adventures of Sherlock Holmes", Sir Arthur Conan Doyle)
How is this word pronounced? Is it pronounced the same as "employee" or is it pronounced as it is in French (I can't do IPA but, to approximate, something like "omp-lwa-yey")?