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- a member of a dynasty of caliphs ruling at Baghdad, a.d. 750–1258, governing most of the Islamic world and claiming descent from Abbas, uncle of Muhammad.
- any caliph of the dynasty that ruled the Muslim empire from Baghdad (750–1258) and claimed descent from Abbas, uncle of Mohammed
- (as modifier)the Abbasid dynasty
dynasty of caliphs of Baghdad (750-1258) claiming descent from Abbas (566-652), uncle of Muhammad. For his name, see abbot.