Source : Webster's Revised Unabridged Dictionary (1913)

Therf \Therf\, a. [AS. ?eorf; akin to OHG. derb, Icel. ?jarfr.]
   Not fermented; unleavened; -- said of bread, loaves, etc.
   [Obs.]

         Pask and the feast of therf loaves.      --Wyclif.