资料来源 : Webster's Revised Unabridged Dictionary (1913)

Leach \Leach\, n. [Written also {letch}.] [Cf. As. le['a]h lye,
   G. lauge. See {Lye}.]
   1. A quantity of wood ashes, through which water passes, and
      thus imbibes the alkali.

   2. A tub or vat for leaching ashes, bark, etc.

   {Leach tub}, a wooden tub in which ashes are leached.