The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]