ˈalməˌjest noun
( -s )
Usage: sometimes capitalized
Etymology: Middle English almageste, from Middle French & Medieval Latin, from Arabic al-majusti the almagest, from al the + Greek megistē ( syntaxis ) greatest (composition), feminine of megistos, superl. of megas great — more at much
: any of several great early medieval treatises on a branch of knowledge (as the 9th century Arabic translation of Ptolemy's Greek work on astronomy)