Abbʹassides (3 syl.).
A dynasty of caliphs who reigned from 750–1258. The name is derived from Abbas, uncle of Mahomet. The most celebrated of them was Haroun-al-Raschid (born 765, reigned 786–808).
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.