The Collaborative International Dictionary of English v.0.48:

Lixivial \Lix*iv"i*al\, a. [L. lixivius, fr. lix ashes, lye
   ashes, lye: cf. F. lixiviel.]
   1. Impregnated with, or consisting of, alkaline salts
      extracted from wood ashes; impregnated with a salt or
      salts like a lixivium.                      --Boyle.
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   2. Of the color of lye; resembling lye.
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   3. Having the qualities of alkaline salts extracted from wood
      ashes.
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   Lixivial salts (Old Chem.), salts which are obtained by
      passing water through ashes, or by pouring it on them.
      [1913 Webster] Lixiviate