oilousadj.
Apparently an editorial misreading of oileous adj.; quot. cites Gerard, who used oileous (see quot. 1597 at oileous adj.).
ΘΚΠ
society > occupation and work > materials > derived or manufactured material > extracted or refined oil > [adjective] > containing oil
oileous1597
oilous1890
1890 Cent. Dict. Oilous, oily, oleaginous. Gerard.
This entry has been updated (OED Third Edition, March 2004; most recently modified version published online March 2018).
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adj.1890