The Collaborative International Dictionary of English v.0.48:

Grume \Grume\ (gr[udd]m), n. [OF. grume, cf. F. grumeau a little
   heap, clot of blood, dim. fr. L. grumus.]
   A thick, viscid fluid; a clot, as of blood. --Quincy.
   [1913 Webster]

WordNet (r) 3.0 (2006):

grume
    n 1: a thick viscous liquid
    2: a semisolid mass of coagulated red and white blood cells
       [syn: blood clot, grume]

Moby Thesaurus II by Grady Ward, 1.0:

68 Moby Thesaurus words for "grume":
   Devonshire cream, Rh factor, Rh-negative, Rh-positive, Rh-type,
   Rhesus factor, antibody, antigen, arterial blood, blood,
   blood bank, blood cell, blood clot, blood count, blood donor,
   blood donor center, blood group, blood grouping, blood picture,
   blood platelet, blood pressure, blood serum, blood substitute,
   bloodmobile, bloodstream, bonnyclabber, casein, circulation,
   clabber, clinical dextran, clot, clotted cream, coagulate,
   coagulum, crassamentum, curd, dextran, embolus, erythrocyte,
   globulin, gore, hematics, hematologist, hematology, hematoscope,
   hematoscopy, hemocyte, hemoglobin, hemometer, humor, ichor,
   isoantibody, legumin, leukocyte, lifeblood, loppered milk,
   neutrophil, opsonin, paracasein, phagocyte, plasma,
   plasma substitute, red corpuscle, serum, thrombus, type O,
   venous blood, white corpuscle