FURLONG, a measure of length, originally the length of a furrow in the "common field" system (from the 0. Eng. f urlang, i.e., "furrow-long") (see CULTIVATION ; LAND TENURE). As the field in this system was generally taken to be a square, io acres in extent, and as the acre varied in different districts and at dif ferent times, the "furlong" also varied. The side of a square containing io statute acres is 220 yd. or 4o poles, which was the usually accepted length of the furlong. This is also the length of s of the statute mile. "Furlong" was as early as the 9th century used to translate the Latin stadium, 8 of the Roman mile.