Lather/ˈlæðər/ Definition 1 of 3Pro Tip 1/2Usage in Hygiene Lather is mostly used to describe the soapy foam in washing and grooming contexts. Ensure you create a good lather to clean your hands effectively. Pro Tip 2/2Visual Imagery Think of lather as visually thick and bubbly, often white or the color of the soap used. The dog was covered in a thick lather during the bath.