One of the mysteries of the English language finally explained.
A non-edible oil obtained from the seeds of the physic nut, Jatropha curcas, used commercially as an ingredient of bio-diesel and in the manufacture of soap and candles.
Mid 19th century; earliest use found in Journal of the Society of Arts. From a first element of uncertain origin, perhaps a misapprehension of Cape Verdean Creole pulga fruit of the physic nut bush + oil. For the connection between pulza oil and the Cape Verde Islands compare quot. 1866.
pulza oil/ˈpʊlzə(r) ˌɔɪl/
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