Like masse, which should also be typed with an accent on the e, and is pronounced like mah-say.
I've posed this before as both a student of linguistics as well as French (many moons ago), but it hasn't grown legs....
In many areas in New England and the UK, possibly because non-rhotic speakers will often pick up the R's left on the table and insert them in odd places (drawring, sawr, idear, gararge)...
I often hear the word pronounced as "mahr say" for massé in the Boston area. In fact, in my head, I hear the word "Marseille" (pronounced mar SAY). Many of you from Boston will now say it out loud and realize that's exactly how you say it: mahr SAY.
Like people say French Fries, Boston Pool, and English on shots, none of these originated in France, Boston, or England respectively.
Etymologically speaking, I only find the french world massé in relation to billiards. I don't ever remember a conjugation of the word in French that included massé (i.e. the verb masser doesn't have anything to do with billiards, vertical motion, spin, etc.)
I've postulated for many years that the word massé is actually a misspelling of Marseille as pronounced in the Boston area or the UK (mahr SAY) possibly because the first people (in the UK?) who saw someone using spin on a cueball may have come from Marseille, France and the term stuck just like we Americans say the term English because undoubtedly the first someone here saw use the magic stuff must have been from a guy with an English accent.
Mingaud was from France, but not Marseille but pretty damned close. It is certain that the initial leather spin practitioners would be from France and that when that art form was introduced to England via exhibition or otherwise, a new English viewer would give the term of that new shot recognition to the one who showed them and the place they were from just like some will call rotation Chicago pool or the 1/15 8-ball as Alabama 8-ball. It's a wonder we don't call side spin "French." But... if it happened to be the guy doing the show was from Marseille... then it all might make sense.
Bob, if you're still reading this... maybe you can have Shamos shut me up on this ? Or, Shamos can add it as a possibility in the history books.
Regards,
Frederic <~~~ the French Way