Sentence:  [γ, 3, white, erroneously placed by Tycho in Pisces marks the extreme tip of the Horse's wing, so that its name <WSD>Algenib</WSD> has been considered as derived from Al Janāh, the Wing, but it probably is from Al Janb, the Side. It has sometimes been written Algemo.] 
Meaning of the word marked with <WSD> tags:  A β Cephei variable (subgiant), visible as a third-(magnitude) blue-white star in the northern (constellation) of (Pegasus), one of four stars in the (asterism) of the Great Square of Pegasus.