Sentence:  In one of the villages I saw the next summer a cow tethered by a rope six <WSD>rods</WSD> longnb.... 
Meaning of the word marked with <WSD> tags:  (sixteenhalffeet) A unit of length equal to 1 pole, a perch, ¼ chain, 5½ yards, 16½ feet, or exactly 5.0292 meters (these being all equivalent).