The Collaborative International Dictionary
Crassamentum
Crassament \Cras"sa*ment\ (kr?s"s?-ment), ||Crassamentum \Cras`sa*men"tum\ (-m?n"t?m), n. [L. crassamentum, fr. crassare to make thick. See Crass, a.] A semisolid mass or clot, especially that formed in coagulation of the blood.
Wiktionary
crassamentum
n. (context obsolete English) The solid component of blood, blood from which serum has been removed; a mass of coagulated blood; a blood clot.