demi-glace


dem·i-glace

D5121300 (dĕm′ē-glăs′)n. A rich, reduced brown sauce usually seasoned with wine and used as a base for other sauces.
[French : demi-, demi- (from demi, half, from Old French; see demi-) + glace, glaze, heavily reduced sauce (from Old French, ice; see glacier).]