👉 The term "nontidal" is a medical term that refers to an organ or tissue that does not produce any blood or other substances. It is often used in medical context to describe organs like lungs, kidneys, and liver that are not involved in producing fluids or waste products. The term is typically associated with conditions such as cystic fibrosis, where the lungs are replaced by a cystic sac, which can cause persistent fluid retention and reduced oxygen supply to the body's tissues. In medical