Large Intestine:The last part of the gastrointestinal tract that absorbs water and salts from material that has not been digested as food, turning it into solid waste.
Rectum:The final straight portion of the large intestine in humans and some other mammals, which ends in the anal canal.
Fecal Matter: Solid or semisolid remains of food that could not be digested or absorbed in the small intestine, expelled through defecation