oleum

Greek-fire was the precursor of gunpowder; it was the oleum incendiarum of the Romans.

Iterumque, Quinti Julii Murranii stagium opobalsamatum, sive myrrhæ oleum opobalsamo permixtum, ad cap.

A sample of B. Oleum Iodine was submitted by the manufacturer and examined.

A few crystals of ammonium chlorid were added to a little of B. Oleum Iodine and treated as above.

From the Latin oleum, formed from olea, olive-tree, the fruit of which abounds in oil.