ĂRŪRA (ἄρουρα), a Greek measure of surface, mentioned by Herodotus,
who says that it is a hundred Egyptian cubits in every direction. Now
the Egyptian cubit contained nearly 17¾ inches; therefore the square
of 100 by 17¾ inches, _i.e._ nearly 148 feet, gives the number of
square feet (English) in the arura, viz. 21,904.