Source : Webster's Revised Unabridged Dictionary (1913)

Shoad \Shoad\, n. [Cf. G. schutt rubbish.] (Mining)
   A train of vein material mixed with rubbish; fragments of ore
   which have become separated by the action of water or the
   weather, and serve to direct in the discovery of mines.
   [Written also {shode}.]