Word Origin & History
almagest
c.1386, treatise on astronomy by Claudius Ptolemy of Alexandria, extended in M.E. to other works on astrology or astronomy, from O.Fr. almageste, from Arabic al majisti, from al "the" + Gk. megiste "the greatest (composition)," from fem. of megistos, superl. of megas "great." Originally titled in Gk. Megale syntaxis tes astronomios "Great Work on Astronomy;" Arab translators in their admiration altered this.