What is the origin of Barmecidal?
It is forgivable, even rational—but nevertheless incorrect—to think that Barmecidal means something like “killing Barm or a Barm or a barm or barms,” just as the adjective homicidal is formed from the noun homicide. Analyzing Barmecidal from back to front, we see the familiar adjectival suffix –al. The element –id or –ide is the not so familiar Greek noun suffix –id, a feminine patronymic suffix having the general sense “offspring of, descendant of,” and used especially with the names of dynasties (such as Pisistratid, Abbasid, Attalid). The first two syllables, Barmec-, come from Persian Barmak, the name of a wealthy Iranian family that was very influential in Baghdad under the Abassid dynasty, and famous for its patronage of the arts and sciences. A Barmecidal banquet (or feast) refers to a story from the The Arabian Nights Entertainments; its “hero” is Ja’far ibn Yahya Barmaki (Ja’far al-Barmaki, also Giafar), who served a beggar a series of empty platters, pretending the empty platters were a sumptuous feast, a fiction or nasty joke that the beggar cheerfully accepted.