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Definition of: Almagest
(al′mə뀇jest) noun
1. Ptolemy's huge work on astronomy, explaining the celestial motions on the geocentric system: named from the title of the Arabian translation of this work made in 827.
2. In medieval science, any authoritative treatise, as upon astrology or alchemy. Also al′ma·gest. [<OF almageste < Arabic almajistī <al the + Gk. megistē (syntaxis) the greatest (work)]
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