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The Collaborative International Dictionary
Leach tub

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.