noun, plural o·le·a [oh-lee-uh] /ˈoʊ li ə/ for 1, o·le·ums for 2.
Origin of oleum
Examples from the Web for oleum
Oleum sarz, L. From the root bark, distilled along with salt-and-water.
Greek-fire was the precursor of gunpowder; it was the oleum incendiarum of the Romans.The Browning Cyclopdia|Edward Berdoe
Oleum cer, L. From beeswax and sand distilled together; the product is rectified once or oftener.
Oleum et operam perdidi—I have lost both the oil and my pains.
Oleum lupuli, L. From commercial hops, by distillation along with water.