The Collaborative International Dictionary of English v.0.48:

Harrower \Har"row*er\ (h[a^]r"r[-o]*[~e]r), n.
   One who harrows.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Harrower \Har"row*er\, n.
   One who harries. [Obs.]
   [1913 Webster]