Almagest

[ al-muh-jest ]
/ ˈæl məˌdʒɛst /

noun

(italics) a Greek work on astronomy by Ptolemy.
(lowercase) any of various medieval works of a like kind, as on astrology or alchemy.

Origin of Almagest

1350–1400; Middle English almageste < Middle French < Arabic al the + majisṭī < Greek megístē (sýntaxis) greatest (composition)
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British Dictionary definitions for almagest

Almagest

/ (ˈælməˌdʒɛst) /

noun

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
(sometimes not capital) any of various similar medieval treatises on astrology, astronomy, or alchemy

Word Origin for Almagest

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 Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012