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Bearnaise (n.)

"egg-and-butter sauce," 1877, from French sauce béarnaise, from fem. of béarnais "of Béarn," region in southwest France (named for the Benarni, a Gaulish tribe).

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Definitions of Bearnaise from WordNet

bearnaise (n.)
a sauce like hollandaise but made with white wine and tarragon and shallots instead of lemon juice;
From wordnet.princeton.edu