See leech.To wash or drain by percolation of water; treat by downward drainage: as, to make lye by leaching ashes (the most familiar use of the word); the rains leach a gravelly soil.To remove by percolation; drain away: as, to leach the alkali from wood-ashes.n. A separation of lye, or alkali in solution, as from wood-ashes, by percolation of water.n. The material used for leaching, as wood-ashes.—3. A deep tub with a spigot inserted in the bottom, used in making potash. It holds from 6 to 8 bushels of wood-ashes.n. See leech.n. A dish, of various kinds, served up in slices. It was sometimes a jelly flavored with spices.To cut into slices; slice.n. Same as latch.n. Same as leash.To extract metal from (an ore) by subjecting it to chemical reagents which take the metal into solution.n. A tank in which hot water is passed through ground bark to obtain tannin. Also latch.