Plethron (πλέθρον) is a measurement used in Ancient times, equal to 100 Greek feet (pous/ποῦς). It was roughly the width of a typical athletic running-track, and was used as the standard width and length of a Wrestling square, since wrestling competitions were held on the racing track in early times. A plethron is given as the size of ...
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http://en.wikipedia.org/wiki/Plethron
• (n.) Alt. of Plethrum
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http://thinkexist.com/dictionary/meaning/plethron/
(from the article `mathematics`) ...of new cities in the Greek colonies of the 6th and 5th centuries, there was regular use of a standard length of 70 plethra (one plethron equals ...
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http://www.britannica.com/eb/a-z/p/80
Pleth'ron Pleth'rum noun ; plural Plethra . [ New Latin , from Greek ....] (Gr. Antiq.) A long measure of 100 Greek, or 101 English, feet; also, a square measure of 10,000 Greek feet.
Found on http://www.encyclo.co.uk/webster/P/107
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