Almagest
Concise Oxford English Dictionary © 2008 Oxford University Press:
Almagest /ˈalmədʒɛst/
▶noun (the Almagest) an Arabic version of Ptolemy's astronomical treatise.
– origin ME: from OFr. almageste, based on Arab., from al ‘the’ + Gk megistē ‘greatest (composition)’.
'Almagest' also found in these Oxford entries:

