Almagest

Almagest

[al-muh-jest]
noun
1.
(italics) a Greek work on astronomy by Ptolemy.
2.
(lowercase) any of various medieval works of a like kind, as on astrology or alchemy.

Origin:
1350–1400; Middle English almageste < Middle French < Arabic al the + majisṭī < Greek megístē (sýntaxis) greatest (composition)

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Almagest (ˈælməˌdʒɛst)
 
n
1.  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.  (sometimes not capital) any of various similar medieval treatises on astrology, astronomy, or alchemy
 
[C14: from Old French, from Arabic al-majisti, from al the + majisti, from Greek megistē greatest (treatise)]

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Etymonline
Word Origin & History

almagest
late 14c., treatise on astronomy by Claudius Ptolemy of Alexandria, extended in M.E. to other works on astrology or astronomy, from O.Fr. almageste, from Arabic al majisti, from al "the" + Gk. megiste "the greatest (composition)," from fem. of megistos, superl. of megas "great" (see
mickle). Originally titled in Gk. Megale syntaxis tes astronomios "Great Work on Astronomy;" Arab translators in their admiration altered this.
Online Etymology Dictionary, © 2010 Douglas Harper
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