The crossword solution for the term FORM A MASS is CLOT. Clotting is a process in which blood cells and proteins form a mass to stop bleeding. It is an important part of the body's natural healing process. Clotting occurs when platelets, a type of blood cell, come into contact with damaged tissue and release chemicals that cause the proteins in the blood to form a CLOT. The CLOT helps to seal off the wound and prevent further bleeding.