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- noun Alternative form of
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But the entrance into Greece through Trachis, in the narrowest part, is no more than a half _plethrum_ in width: however, the narrowest part of the country is not in this spot, but before and behind Thermopylæ; for near
Close to this city was a pyramid of stone, one plethrum in breadth, two plethra in height ....
After this occurrence they proceeded seven days 'journey, five parasangs each day, till they came to the river Phasis,  the breadth of which is a plethrum.
From the Tigris they proceeded, in four days 'march, a distance of twenty parasangs, to the river Physcus, which was a plethrum in breadth, and over which was a bridge.
Near the city was a stone pyramid of the breadth  of one plethrum, and the height of two plethra.
Marching through this region, they came to the river Mascas, the breadth of which is a plethrum.
After these occurrences, Cyrus proceeded four days 'march, a distance of twenty parasangs, to the river Chalus, which is a plethrum in breadth, and full of large tame fish, which the Syrians looked upon as gods, and allowed no one to hurt either them or the pigeons.
Thence he advanced, five days 'march, a distance of thirty parasangs, to the source of the river Dardes, which is a plethrum in breadth.
 The main street, according to Diodorus, was "forty stadia in length, and a _plethrum_ (100 feet) in breadth; adorned through its whole extent by a succession of palaces and temples of the most costly magnificence.
Blackwood's Edinburgh Magazine — Volume 55, No. 339, January, 1844
Append.sect. 12, makes it 3 miles, 787-1/2 yards.] [Footnote 20: The _plethrum_ was 100 Greek or 101.125 English feet.
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