Definitions for "Abbasid"
The second major Muslim dynasty, the Abbasids, took their name from their ancestor, al-Abbas ibn Abd al-Muttalib, who was the uncle of the Prophet (saws). After succeeding the Umayyads in 749CE, they ruled for the next 500 years, although in reality their effective power declined after around 900CE.
Abbasid is the second Islamic dynasty. This Arabic family was descended from Abbas, the uncle of the Prophet Muhammad. The Abbasids ruled in Egypt in AD 750-868 and AD 905-935.
uh bas id, ab uh sid] Dynasty that succeeded the Umayyads as caliphs within Islam; came to power in 750 c.e. (p. 295)