Al·ma·gest ( l m -j st )n. 1. A comprehensive treatise on astronomy, geography, and mathematics compiled by Ptolemy about a.d. 150. 2. almagest Any of several medieval treatises concerned with astronomy or alchemy. [Middle English almageste, from Old French, from Arabic al-majisti : al-, the + Greek megist  (suntaxis), greatest (composition), feminine of megistos, greatest, superlative of megas, great; see meg- in Indo-European roots.] |
Almagest [ˈælməˌdʒɛst]
n
1. (Astronomy) a work on astronomy compiled by Ptolemy in the 2nd century a.d containing a description of the geocentric system of the universe and a star catalogue.
2. (Historical Terms) (sometimes not capital) any of various similar medieval treatises on astrology, astronomy, or alchemy
[from Old French, from Arabic al-majisti, from al the + majisti, from Greek megistē greatest (treatise)]
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