Webster's New American Dictionary: leach, vt. To wash with water in order to separate some soluble element from, as, to Leach wood ash to obtain lye; to obtain by this process, as, to Leach lye from wood ashes.---n. Perforated vessel used in the manufacture of lye. Leacher n. leech, n. A flat bloodsucking worm that lives in water and was formerly used by doctors to bleed patients. Edge of sail.--vt. To heal. Pat, in Indiana