What is "d'egras"

D'egras \D['e]`gras"\, Degras \Deg"ras\, n. [F.; cf. F. gras, a. & n., fat.] A semisolid emulsion produced by the treatment of certain skins with oxidized fish oil, which extracts their soluble albuminoids. It was formerly solely a by-product of chamois leather manufacture, but is now made for its own sake, being valuable as a dressing for hides.