nummulation

1. (physiology, rare) The arrangement of the red blood corpuscles in rouleaux, like piles of coins, as when a drop of human blood is examined under the microscope.Examples: "A marked peculiarity of these bodies is their tendency to cohere immediately after the blood is drawn, thus forming Schultze's grannule-masses, and this process is analogous to the nummulation of the red corpuscules."; "Examples of the other blood coagulation system measurement items include coagulation of blood (blood clotting), …, nummulation of red blood cells, blood aggregation, …, and fibrinolysis."rare