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Almagest

[al-muh-jest] /ˈæl məˌdʒɛst/
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
1350-1400; Middle English almageste < Middle French < Arabic al the + majisṭī < Greek megístē (sýntaxis) greatest (composition)
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for Almagest

Almagest

/ˈælməˌdʒɛst/
noun
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
Word Origin
C14: from Old French, from Arabic al-majisti, from al the + majisti, from Greek megistē greatest (treatise)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for Almagest
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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