What is the X in X-mas?
1758, from past participle stem of Modern Latin lixiviare, from Latin lixivium, neuter of lixivius "made into lye," from lix "ashes, lye."
lixiviation lix·iv·i·a·tion (lĭk-sĭv'ē-ā'shən)
The removal of the soluble constituents of a substance by the action of a percolating liquid. Also called leaching.