I suppose it depends on which language you are referring to, and you must be referring to Latin as both common English words, opi and opuses, have already been mentioned.
Hmmmm...This was a coach builder who built a very limited number of A6G Coupes for MAserati....Cannot remember how many but 21 or 31 sticks in my mind.
Oooooo close, but not quite the answer I was looking for. However, I'm out and your answer may well be correct too Andy. They built the most 5000GTs for sure.