noun ·see 3d leech.
2. leach ·noun ·see leech, a physician.
3. leach ·noun a tub or vat for leaching ashes, bark, ·etc.
4. leach ·vi to part with soluble constituents by percolation.
5. leach ·vt to dissolve out;
often used with out; as, to leach out alkali from ashes.
6. leach ·noun a quantity of wood ashes, through which water passes, and thus imbibes the alkali.
7. leach ·vt to remove the soluble constituents from by subjecting to the action of percolating water or other liquid; as, to leach ashes or coffee.