hollandaise sauce

from The Collaborative International Dictionary of English v.0.48

Hollandaise sauce \Hol`lan*daise" sauce\, or Hollandaise
\Hol`lan*daise"\, n. [F. hollandaise, fem. of hollandais Dutch.]
   (Cookery)
   A sauce consisting essentially of a seasoned emulsion of
   butter and yolk of eggs with a little lemon juice or vinegar.
   [Webster 1913 Suppl.]