- Lusitropy
- Luspatercept
- Lutathera
- Luteal insufficiency
- Luteal phase
- Luteal support
- Lutein
- Luteinization
- Lutembacher's syndrome
- Luteolin
- Luteoma
- Lutidine
- Lutzomyia
- Luxol fast blue stain
- Luxturna
- Ly49
- Ly6
- Lycium barbarum
- Lycium chinense
- Lycopene
- Lycopodium clavatum
- Lycorine
- Lye
- Lying-in
- Lyl1
- Lyme disease
- Lymecycline
- Lymph
- Lymph duct
- Lymph fluid
- Lymph node biopsy
- Lymph node metastasis
- Lymph nodes
- Lymph sacs
- Lymph vessels
- Lymphadenectomy
- Lymphadenitis
- Lymphadenopathy
- Lymphangiectasia
- Lymphangiectasis
- Lymphangiogenesis
- Lymphangiography
- Lymphangioleiomyomatosis
- Lymphangioma circumscriptum
- Lymphangiomas
- Lymphangiomatosis
- Lymphangion
- Lymphangiosarcoma
- Lymphangitis
- Lymphangitis carcinomatosa
- Lymphatic capillary
- Lymphatic disease
- Lymphatic drainage
- Lymphatic endothelium
- Lymphatic filariasis
- Lymphatic system
- Lymphatic tissue
- Lymphatic tissues
- Lymphatic vessels
- Lymphedema
- Lymphedema-distichiasis syndrome
- Lymphedema–distichiasis syndrome
- Lymphoblasts
- Lymphocele
- Lymphocryptovirus
- Lymphocyte
- Lymphocyte activation
- Lymphocyte count
- Lymphocyte-activation gene 3
- Lymphocytic choriomeningitis
- Lymphocytic choriomeningitis virus
- Lymphocytic colitis
- Lymphocytic hypophysitis
- Lymphocytic infiltration
- Lymphocytic interstitial pneumonia
- Lymphocytic leukemia
- Lymphocytic pleocytosis
- Lymphocytopenia
- Lymphocytosis
- Lymphoedema
- Lymphoepithelial lesion
- Lymphoepithelioma
- Lymphoepithelioma-like carcinoma
- Lymphogranuloma venereum
- Lymphoid cells
- Lymphoid enhancer-binding factor 1
- Lymphoid hyperplasia
- Lymphoid leucosis
- Lymphoid leukemia
- Lymphoid progenitor cell
- Lymphoid tissue
- Lymphoid tissues
- Lymphokines
- Lymphoma
- Lymphomatoid granulomatosis
- Lymphomatoid papulosis
- Lymphopaenia
- Lymphopenia
- Lymphoplasmacytic lymphoma
- Lymphopoiesis
- Lymphoproliferative disease
- Lymphoproliferative disorder
- Lymphoproliferative disorders
- Lymphoproliferative response
- Lymphoscintigraphy
- Lymphotoxin
- Lymphotoxin alpha
- Lymphovascular invasion
- Lynch syndrome
- Lynch syndrome II
- Lynestrenol
- Lys-N
- Lysergamides
- Lysergic acid
- Lysergide
- Lysergol
- Lysin
- Lysine
- Lysine acetylsalicylate
- Lysine decarboxylase
- Lysinuric protein intolerance
- Lysis
- Lysis buffer
- Lysobisphosphatidic acid
- Lysogenic
- Lysogenic cycle
- Lysogeny
- Lysol
- Lysophosphatidylcholine
- Lysophosphatidylethanolamine
- Lysophosphatidylinositol
- Lysophosphatidylserine
- Lysophospholipase
- Lysosomal
- Lysosomal storage disease
- Lysosomes
- Lysostaphin
- Lysozyme
- Lyssavirus
- Lysyl hydroxylase
- Lysyl oxidase
- Lytic cycle
- Lytta vesicatoria
- M cells
- M current
- M mode echocardiography
- M protein
- M1 protein
- M2 AML
- M2 protein