The Collaborative International Dictionary of English v.0.48:

Tarsel \Tar"sel\, n.
   A male hawk. See Tercel. [Obs.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Tercel \Ter"cel\, n.
   See Tiercel. Called also tarsel, tassel. --Chaucer.
   [1913 Webster]