The Collaborative International Dictionary of English v.0.48:

Scraw \Scraw\ (skr[add]), n. [Ir. scrath a turf, sgraith a turf,
   green sod; akin to Gael. sgrath, sgroth, the outer skin of
   anything, a turf, a green sod.]
   A turf. [Obs.] --Swift.
   [1913 Webster]