Letch

Definitions:

To wash, as ashes, to separate the alkali.
- Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874. (verb) (v.) (verb)
To separate, as an alkali from ashes by percolation.
- Nuttall's Standard dictionary of the English language. By Nuttall, P.Austin. Published 1914. (verb) (v.) (verb)
A tub or vat in which to make lye by causing water to pass through wood ashes in order to separate the alkali.
- Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874. (noun) (n.) (noun)