Definition of almagest
: any of several early medieval treatises on a branch of knowledge
Origin and Etymology of almagest
Middle English almageste, from Anglo-French & Medieval Latin, from Arabic al-majusti, the Arabic version of Ptolemy's astronomy treatise, from al the + Greek megistē (syntaxis), literally, greatest (composition)
First Known Use: 14th century
Seen and Heard
What made you want to look up almagest? Please tell us where you read or heard it (including the quote, if possible).