One of the mysteries of the English language finally explained.
A dark yellow oil obtained from the seeds of the tree Pongamia pinnata (family Fabaceae (Leguminosae)) and used in India as a treatment for certain skin diseases, as oil for lamps, as a bio-fuel, and as a pesticide.
Mid 19th century; earliest use found in John Lindley (1799–1865), botanist and horticulturist. From Tamil puṅku, puṅkam the tree Pongamia pinnata + oil.
poonga oil/ˈpuːŋɡə(r) ɔɪl/
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