Definition: In the context of medicine, "urethan" refers to a type of bladder stone. It is characterized by hard, lumpy material that can form in the urethra (the tube that carries urine from the kidneys) and can cause pain, discomfort, and sometimes symptoms such as blood or pus in the urine. Urethans are often caused by an infection or blockage, which can be treated with medications and other treatments. Urethans can also be a sign of