| Lactase | |
| Lactate | See Lactation. |
| Lactates | See Lactation. |
| Lactating | See Lactation. |
| Lactation | |
| Lactobacillus | |
| Lacto-Ovo-Vegetarian | See Vegetarian. |
| Lactose Intolerance | |
| Lactose Intolerant | See Lactose Intolerance. |
| Laparoscope | See Laparoscopy. |
| Laparoscopy | |
| Larva Currens | See Strongyloides stercoralis. |
| Laryngeal | See Larynx. |
| Laryngitis | |
| Larynx | |
| Laxative | |
| Laxatives | See Laxative. |
| lb | See Pound. |
| lbs | See Pound. |
| LDL | See Low-Density Lipoprotein. |
| Learning Disabilities | See Learning Disorder. |
| Learning Disability | See Learning Disorder. |
| Learning Disorder | |
| Learning Disorders | See Learning Disorder. |
| Lecithin | |
| Leiomyoma | See Leiomyomas. |
| Leiomyomas | |
| Leiomyosarcoma | See Leiomyosarcomas. |
| Leiomyosarcomas | |
| LES | See Lower Esophageal Sphincter. |
| Lesion | |
| Lesions | See Lesion. |
| Leucine | |
| Leukemia | |
| Leukocyte | |
| Leukocytes | See Leukocyte. |
| Leukocytosis | |
| Leukopenia | |
| Leukoplakia | |
| Leukorrhea | Discharge from the vagina of a white or yellowish viscous fluid with pus and mucus cells. |
| Leukosis | Abnormal proliferation of any of the tissues that produce white blood cells. |
| Limbic | Usually referring to the Limbic system: Brain structures, including hippocampus, dentate gyrus, and amygdala. |
| Liniment | |
| Lipase | |
| Lipid | |
| Lipids | See Lipid. |
| Lipoblastoma | See Lipomas. |
| Lipoblastomas | See Lipomas. |
| Lipoic acid | |
| Lipolytic | Breaking down fat. |
| Lipoma | See Lipomas. |
| Lipomas | |
| Lipophilic | Agent that dissolves fats, e.g., alcohol. |
| Lipoprotein | See Lipoproteins. |
| Lipoproteins | |
| Liposarcoma | See Liposarcomas. |
| Liposarcomas | |
| Liter | A metric measure of volume equivalent to 1.057 liquid quarts or 0.2642 gallons. |
| Liters | See Liter. |
| Lithiasis | Having stones, usually in reference to the kidneys and urinary tract, sometimes to the gall bladder apparatus. Technically this can also refer to salivary gland calculi and impacted precipitants in the seminal vesicles or prostate. |
| Litre | See Liter. |
| Litres | See Liter. |
| Liver | |
| Liver Cirrhosis | See Cirrhosis. |
| Liver Spots | See Age Spots. |
| Long Term Memory | See Long-Term Memory. |
| Long-Term Memory | |
| Loop Diuretic | Fast-acting, highly effective agents increasing excretion of urine by acting on the loop of Henle in the kidney. |
| Low Adrenal Function | See Adrenal Insufficiency. |
| Low-Density Lipoprotein | |
| Lower Esophageal Sphincter | |
| Lumbago | |
| Lumbar | Lumbar Region: The lower back, five segments of the spinal chord and column, between the sacrum and thoracic regions. |
| Lumbar Puncture | See Spinal Tap. |
| Lumbar Region | See Lumbar. |
| Lumen | Space in the interior of a tubular structure. |
| Lung | |
| Lungs | See Lung. |
| Luteinizing Hormone | |
| Lymph | |
| Lymph Gland | See Lymph Nodes. |
| Lymph Glands | See Lymph Nodes. |
| Lymph Node | See Lymph Nodes. |
| Lymph Nodes | |
| Lymphadenitis | |
| Lymphadenopathy | |
| Lymphangioma | See Lymphangiomas. |
| Lymphangiomas | |
| Lymphangiosarcoma | See Angiosarcomas. |
| Lymphangiosarcomas | See Angiosarcomas. |
| Lymphangitis | See Lymphadenitis. |
| Lymphatic | See Lymph Nodes. |
| Lymphatic System | |
| Lymphocyte | |
| Lymphokines | |
| Lymphoma | |
| Lymphomas | See Lymphoma. |
| Lysine | |
| Lysozyme | |
