In Egypt, a unit of dry capacity, = 516.625 milliliters (about 0.938 U.S. dry
pints). 
In the 19th century, it was about 477.8 milliliters.
Also romanized as rubca or just rub'.
Socrates Spiro Bey.
An English-Arabic Vocabulary of the Modern and Colloquial Arabic of Egypt. 3rd edition.
Cairo: Elias’ Modern Press, 1929.
Page xi.
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