Definition of "oyl"

Near to the Iſland Hainan are caught Whales,after the ſame manner as the Hollanders and Engliſh in the North about Greenland, whereof they make Oyl which ſerves for ſeveral uſes.

1669, John Nievhoff, translated by John Ogilby, An Embassy from the Eaſt-India Company of the United Provinces, to the Grand Tartar Cham Emperour of China‎, London: John Macock, page 270

...into the glands that separate the oyl abovesaid.

1734, William Stukeley, Of the Gout, J. Roberts, page 14