a unit of capacity used for dry measure in Egypt and neighboring countries, officially equivalent in Egypt to 5.62 U.S. bushels, but varying greatly in different localities.
Origin: 1860–65; < dial. Ar ardabb ≪ Aram 'rdb, perh. < OPers; cf. Egyptian Demotic 'rtb, late Akkadian ardabu, Elamite irtiba, Syriac 'arṭba, Gk artábē, Ar 'irdabb ≪ Aram
ar·deb (är'děb') n. A unit of dry measure in several countries of the Middle East, standardized in Egypt to equal 198 liters (5.62 U.S. bushels) but varying widely elsewhere.
[Arabic dialectal 'ardabb, from Aramaic 'rdb or Coptic artab or Greek artabē, all probably of Old Persian origin.]