| Term | Definition |
| Agammaglobulinemia | The loss of the ability to produce antibodies |
| AIDS | Acquired immune deficiency syndrome |
| Anemia | Decrease in red blood cells |
| Antibody | Adefense provided by the body against an antigen |
| Anticoagulant | An agent that delays or inhibits blood clotting |
| Antigen | Harmful invader |
| Autoimmune disease | Body produces antibodies against itself causing injury |
| Autologous transfusion | A transfusion prepared from a donor's own blood |
| Blood | composed of liquid plasma, red blood cells, white blood cells, and platelets |
| CBC | Complete blood count |
| Centrifuge | A device that spins test tubes of blood |
| Coumadin | An oral anticoagulant |
| CSF | Cerebrospinal fluid |
| Diff | White cell differential |
| Diuretics | Remove edema through urination |
| Dysphagia | difficulty swallowing |
| Dyspnea | Difficult breathing |
| Erythema | Redness of the skin |
| Erythrocytolysis | Destruction of red blood cells |
| Erythrocyte | Red blood cell |
| Erythrocyte sedimentation rate | A blood test done to test for inflammation |
| Erythropenia | A decrease in red blood cells |
| Erythropoiesis | Production of red blood cells |
| Hct | Hematocrit |
| Hematocrit | The volume of packed red cells |
| Hematoma | Blood vessel breakage |
| Hemoglobin | Transports oxygen in the body |
| Hemoglobin A1C | Blood test that indicates an average blood glucose level over a few months |
| Hemophilia | A bleeding disorder |
| Hemosiderosis | Abnormal increase of iron in blood |
| Heparin | An intravenous anticoagulant |
| Hepatomegaly | Enlargement of the liver |
| Hepatosplenomegaly | Enlargement of the liver and spleen |
| Hodgkin's disease | Canceer of the lymphatic tissue |
| Homologous transfusion | A transfusion prepared from a donor's compatible blood |
| Hypoproteinemia | Decrease in the blood protein level |
| Hypotension | Low blood pressure |
| Immunologist | One who specializes in the study of protections |
| Intravenous | Into a vein |
| Leukocytosis | Abnormal increase of white blood cells |
| Leukopenia | Decrease of white blood cells |
| Local edema | Edema limited to a specific area |
| Lupus erythematosus | Autoimmune disease that affects connective tissue |
| Lymphatic system | A network of structures which drains fluid from tissue spaces and returns it to the blood |
| Lymphocyte | White blood cell |
| Monocyte | A single cell |
| Morphology | The study of shape |
| Palliative | Treatment provided to relieve symptoms |
| Pallor | Paleness |
| Pcv | Packed cell volume |
| Phagocytosis | Condition of cell eating |
| Phlebotomy | To draw blood |
| Plasma | the liquid portion of blood |
| PT | Prothrombin time (clotting time) |
| RBC | Red blood count |
| Reticulocyte | Immature cells |
| Splenomegaly | Enlargement of the spleen |
| Splenorrhexis | Rupture of the spleen |
| Syncope | Fainting |
| Systemic edema | Generalized edema |
| Tachycardia | Rapid heart beat |
| Thrombocyte | Platelet |
| Thrombocytopenia | Decrease of platelets |
| Thrombolysis | Destruction of a clot |
| Thrombus | A blood clot |
| Tonsillectomy | Surgical removal of the tonsils |
| Tonsillitis | Inflammation of the tonsils |
| Tourniquet | Thin strip of latex tied aroung the upper arm during phlebotomy |
| Vertigo | Dizziness |
| WBC | White blood count |