資料來源 : Webster's Revised Unabridged Dictionary (1913)

Roux \Roux\, n. [F. beurre roux brown butter.] (Cookery)
   A thickening, made of flour, for soups and gravies.

資料來源 : WordNet®

roux
     n : a mixture of fat and flour heated and used as a basis for
         sauces