Etymology
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discus (n.)

circular piece of stone or metal plate about 12 inches in diameter, pitched from a fixed spot the greatest possible distance as a gymnastic exercise and an athletic contest, 1650s, from Latin discus "discus, disk," from Greek diskos "disk, quoit, platter," related to dikein "to throw," which is perhaps from PIE *dik-skos-, from root *deik- "to show, pronounce solemnly; also in derivatives referring to the directing of words or objects" [Watkins]; but Beekes says dikein is of Pre-Greek origin. The notion is "to throw" as "to direct an object."

updated on September 01, 2018

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Definitions of discus from WordNet

discus (n.)
an athletic competition in which a disk-shaped object is thrown as far as possible;
discus (n.)
a disk used in throwing competitions;
Synonyms: saucer
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.