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