LATHER

lather. Lather, n. froth of soap and water, a sweat

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Lath″er (lăt͡h″ẽr), n. [[AS. leáðor niter, in leáðorwyrt soapwort; cf. Icel. lauðr; perh. akin to E. lye.]] 1. 1. Foam or froth made by soap moistened with water.
2. 2. Foam from profuse sweating, as of a horse.