1. (n.) The watery portion of certain animal fluids, as blood, milk, etc.

2. (n.) A thin watery fluid, containing more or less albumin, secreted by the serous membranes of the body, such as the pericardium and peritoneum.

Rh factor Rh-negative Rh-positive Rh-type Rhesus factor agglutinin allergen anaphylactin antiantibody antibody antigen antiserum antitoxic serum antitoxin antivenin arterial blood arterial transfusion blood blood bank blood cell blood count blood donor blood donor center blood group blood grouping blood picture blood platelet blood pressure blood serum blood substitute blood transfusion bloodmobile bloodstream chyle circulation clinical dextran colostrum dextran direct transfusion discharge drip transfusion erythrocyte exchange transfusion exsanguination transfusion exsanguino transfusion gleet globulin gore grume hematics hematologist hematology hematoscope hematoscopy hemocyte hemoglobin hemometer humor ichor incomplete antibody interferon isoantibody lachryma lactation leukocyte leukorrhea lifeblood lymph matter milk mucor mucus neutrophil opsonin peccant humor perfusion phagocyte phlegm plasma plasma substitute plasma transfusion precipitin purulence pus reciprocal transfusion red corpuscle replacement transfusion rheum saliva sanies serous fluid serum transfusion snot suppuration sweat tear teardrop the whites transfusion type O urine venous blood venous transfusion white corpuscle