Definitions of Letch

1. man with strong sexual desires

2. See Leach.

3. Strong desire; passion. ( Archaic).

4. To separate, as an alkali from ashes by percolation.

5. A tub or vat in which to make lye by causing water to pass through wood ashes in order to separate the alkali.

6. To wash, as ashes, to separate the alkali.