Bé•ar•naise(ber nāz′, bā′ər-; Fr. bā ar nez′),USA pronunciationn.
(sometimes l.c.) a sauce of egg yolks, shallots, tarragon, butter, vinegar, and sometimes white wine and chopped chervil. Also called Béarnaise′ sauce′.
French, equivalent. to Béarn district in SW France + -aise, feminine of -ais -ese