discus

Concise Oxford English Dictionary © 2008 Oxford University Press:
discus /ˈdɪskəs/

▶noun (pl. discuses)

• 1 a heavy thick-centred disc thrown by an athlete, in ancient Greek games or in modern field events.

• 2 a small colourful South American freshwater fish with a rounded laterally compressed body. [Genus Symphysodon: several species.]

– origin via L. from Gk diskos.