The Collaborative International Dictionary of English v.0.48:

Fitch \Fitch\ (?; 224), n.; pl. Fitches. [See Vetch.]
   1. (Bot.) A vetch. [Obs.]
      [1913 Webster]

   2. pl. (Bot.) A word found in the Authorized Version of the
      Bible, representing different Hebrew originals. In Isaiah
      xxviii. 25, 27, it means the black aromatic seeds of
      Nigella sativa, still used as a flavoring in the East.
      In Ezekiel iv. 9, the Revised Version now reads spelt.
      [1913 Webster]