Al'ma-gest, n.

n. [From Gr. μέγιστος, greatest, largest, superl. of μέγας, great, large, and the Ar. article al, the, so called by the Arabs, because this book of Ptolemy was considered as the greatest or largest on that subject (μεγάλη σύνταξις); Fr. almageste, L. Lat. almageste.] A collection of problems drawn up by Ptolemy, containing a complete exposition of the state of geometry and astronomy as they existed in his time. Whewell.