fumet

[F. fumet odor, fume of wine or meat, fr. L. fumus smoke. See Fume, n.]
The stench or high flavor of game or other meat when kept long. Swift.

French; concentrated stock from meat, fish, or vegetables prepared by boiling down to a syrupy consistency, used to give flavour and body to sauces.

[fyoo-MAY; foo-MAY] A concentrated stock, particularly one made from fish or mushrooms, used to add flavor to less intensely flavored stocks or sauces. See also fond.