The term RELATING TO THE ABDOMEN can be summarized by the 6-letter word 'CELIAC'. Celiac disease is an autoimmune disorder that affects the digestive system, specifically the small intestine. It is triggered by the consumption of gluten, a protein found in wheat, barley, and rye. Symptoms of celiac disease include abdominal pain, bloating, diarrhea, and weight loss. Treatment for celiac disease involves following a strict gluten-free diet.