Plural of discus; multiple disc-shaped objects thrown in athletic competition, or plural of the fish called discus.
From Latin 'discus' (a disk, quoit), which comes from Greek 'diskos' (disk). The plural adds '-es' following English pluralization rules for words ending in '-us'.
The word 'discus' has dual lives: in sports, it's a heavy disk thrown in the Olympic hammer throw event, but in aquariums it's a colorful tropical fish that's disc-shaped. Most people only know the sport meaning, not realizing discus fish are named after the throwing implement.
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