nummulation

Etymology
From.

Noun

 * 1)  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.
 * 2) * 1886 William Osler, “Cartwright Lectures on Certain Problems in the Physiology of the Blood,” Lecture 1, in Gaillard’s Medical Journal Volume 42:
 * 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.
 * 1) * 2019, Aya Murata et al., United States Patent Application Pub. No. 2019/0049428 A1:
 * Examples of the other blood coagulation system measurement items include coagulation of blood (blood clotting), [...], nummulation of red blood cells, blood aggregation, [...], and fibrinolysis.