Sentence:  [<WSD>Markab</WSD>—Flamsteed's Marchab—is the Arabs' word for a Saddle, Ship, or Vehicle,—anything ridden upon,—that was early applied to this star; but they also designated it as Matn al Faras, the Horse's Withers or Shoulder, and Bayer cited Yed Alpheras, the Horse's Hand, or, more properly, Forearm,—the Arabian Yad.] 
Meaning of the word marked with <WSD> tags:  A (subgiant), visible as a second-(magnitude) bluish star in the northern (constellation) of (Pegasus), one of four stars in the (asterism) of the Great Square of Pegasus, one of the (lunar stars) observed in navigation.