noun foam from profuse sweating, as of a horse.
2. lather ·noun foam or froth made by soap moistened with water.
3. lather ·noun to spread over with lather; as, to lather the face.
4. lather ·vt to beat severely with a thong, strap, or the like; to flog.
5. lather ·vi to form lather, or a froth like lather; to accumulate foam from profuse sweating, as a horse.