Letch

1. Strong desire; passion.
2. A lecher.

noun

A stream or pool in boggy land.

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.
3. A jelly-like sweetmeat popular in the fifteenth century.

   1670 Hannah Woolley The Queen-like Closet, Or, Rich Cabinet https//en.m.wikipedia.org/wiki/The_Queen-Like_Closet "To make Leach and to colour it"

1. To purge a soluble matter out of something by the action of a percolating fluid.

   Heavy rainfall can leach out minerals important for plant growth from the soil.

2. To part with soluble constituents by percolation.

1. An aquatic blood-sucking annelid of class Hirudinea, especially Hirudo medicinalis.
2. A person who derives profit from others in a parasitic fashion.
3. A glass tube designed for drawing blood from damaged tissue by means of a vacuum.

1. A physician.
2. (Heathenry) A healer.

1. The vertical edge of a square sail.
2. The aft edge of a triangular sail.