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Almagest

Al·ma·gest [ álmə jèst ] (plural Al·ma·gests)


noun 
Definition:
 
1. astronomy text: a text on astronomy written by Ptolemy in the 2nd century ad setting out his view of the universe with the Earth at its center surrounded by spheres

2. medieval treatise on astronomy: an important medieval treatise on a subject, especially on astronomy, astrology, or alchemy

[14th century. Via Old French< Arabic al-mijistī "the greatest" < Greek megistē "greatest," superlative of megas "great" (see mega-)]
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