noun, plural discuses, disci [dis-ahy] .
a circular disk more than 7 inches (18 cm) in diameter and 2.2 pounds (1 kg) in weight, usually wooden with a metal rim and thicker in the center than at the edge, for throwing for distance in athletic competition.
the sport of throwing this disk for distance.

1650–60; < Latin < Greek dískos a quoit, discus, disk, derivative of diskeîn to throw

discus, discuss.
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World English Dictionary
discus (ˈdɪskəs)
n , pl discuses, disci
1.  (originally) a circular stone or plate used in throwing competitions by the ancient Greeks
2.  athletics
 a.  a similar disc-shaped object with a heavy middle thrown by athletes
 b.  (as modifier): a discus thrower
3.  the discus the event or sport of throwing the discus
4.  a South American cichlid fish, Symphysodon discus, that has a compressed coloured body and is a popular aquarium fish
[C17: from Latin, from Greek diskos from dikein to throw]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1656, from L. discus "discus, disk," from Gk. diskos "disk, quoit, platter."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

discus dis·cus (dĭs'kəs)
n. pl. dis·ci (dĭs'kī', dĭs'ī')
A flat circular surface; a disk.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Close by are a diamond-encrusted conch shell and discus, his traditional accessories.
We see a group of three, their round, discus-style dorsal fins splitting the water in a staccato pace.
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