butyraceous
Adjective (boo-tuh-rey-shuhs)
of the nature of, resembling, or containing butter.
Citations for butyraceous,
And, certainly, fine food, lots of the best wine, had given his jowls a butyraceous sheen.
Ken Bruen, Purgatory, 2013
The notion of abstracting the butyraceous part of cream by witchcraft, was prevalent not only in the highlands, but also in the lowlands of Scotland…
Alexander Campbell, The Grampians Desolate, 1804
Butyraceous can be traced to the Latin word for butter, butyrum, with the -aceous suffix meaning "resembling, having the nature of." It entered English in the mid-1600s.
Dictionary.com
