Almagest

 
Pronunciation: /ˈalmədʒɛst/

noun

(the Almagest)
  • an Arabic version of Ptolemy’s astronomical treatise.
  • (in the Middle Ages) any celebrated textbook on astrology and alchemy.

Origin:

late Middle English: from Old French almageste, based on Arabic, from al 'the' + Greek megistē 'greatest (composition)'