lather

[A. S. leádhor; cogn. with Icelandic laudhr, lödhr =froth, foam, scum; laudhra, lödhra =to foam; leydhra =to wash. From the same root as Lat. lavo =to wash; Eng. lave.] 1. Froth or foam made by soap moistened with water. 2. Froth or foam caused by profuse sweating, as on a horse.