In Egypt, a unit of dry capacity, = 516.625 milliliters (about 0.938 U.S. dry pints). chart symbol 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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