/mir pwah"/ , n.
1. a flavoring made from diced vegetables, seasonings, herbs, and sometimes meat, often placed in a pan to cook with meat or fish.
2. finely chopped vegetables, as onions and carrots, sometimes with meat, often used as a bed for meat that is to be braised.
Also, mirepois .
[ 1875-80; Mirepoix, 18th-century French diplomat ]