The Collaborative International Dictionary of English v.0.48:

Leach \Leach\, v. t. [imp. & p. p. Leached; p. pr. & vb. n.
   Leaching.] [Written also leech and letch.]
   1. To remove the soluble constituents from by subjecting to
      the action of percolating water or other liquid; as, to
      leach ashes or coffee.
      [1913 Webster]

   2. To dissolve out; -- often used with out; as, to leach out
      alkali from ashes.
      [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

42 Moby Thesaurus words for "leached":
   acarpous, arid, barren, celibate, childless, desert, desolate,
   drained, dried-up, dry, exhausted, fallow, fruitless, gaunt,
   gelded, impotent, ineffectual, infecund, infertile, issueless,
   jejune, menopausal, nonfertile, nonproducing, nonproductive,
   nonprolific, sine prole, sterile, sucked dry, teemless,
   uncultivated, unfertile, unfruitful, unplowed, unproductive,
   unprolific, unsown, untilled, virgin, waste, wasted,
   without issue