Sentence:  George Kerr , the swift striding Jamaican , set a meet record in the 600 - <WSD>yard</WSD> run in the Knights of Columbus track meet tonight , beating Purdue 's Dave Mills in a hot duel in 1.10.1 . 
Meaning of the word marked with <WSD> tags:  a unit of length equal to 3 feet; defined as 91.44 centimeters; originally taken to be the average length of a stride