Roughage (noun)

1. Fibrous plant material, such as hay or straw, that is not easily digested but is essential for the health of the digestive system.
2. Dietary fibers from fruits, vegetables, and whole grains that are not broken down by the body's enzymes and promote regular bowel movements by increasing bulk and water in the stool.

Origin:

From middle english "roughage".

Examples:

1. Roughage is an important part of a balanced diet.
2. Roughage helps to prevent constipation.
3. Roughage is found in fruits, vegetables, and whole grains.
4. The horse's diet should include plenty of roughage.
5. Roughage is a good source of dietary fibers.