- 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
- MA plot
- MADS-box
- MAF
- MAFA
- MAFB
- MAFF
- MALAT1
- MALBAC
- MALT
- MALT lymphoma
- MAP kinase kinase kinase
- MAP2K4
- MAP3K1
- MAP3K7
- MAPK phosphatase
- MAPK1
- MAPK10
- MAPK11
- MAPK14
- MAPK15
- MAPK3
- MAPK8
- MAPKAPK2
- MAPKK
- MARK3
- MARK4
- MASP1
- MASP2
- MASS syndrome
- MBD1
- MBD3
- MBL deficiency
- MC1R
- MC3T3
- MCF-7
- MCHC
- MCM6
- MCPA
- MCV
- MCherry
- MD
- MDA-MB-453
- MDA-MB-468
- MDA5
- MDAT
- MDEA
- MDMA
- MDMA-assisted psychotherapy
- MDPV
- MDS
- MDia1
- MECP2
- MECP2 duplication syndrome
- MED1
- MEF2
- MEF2B
- MEF2C
- MEF2D
- MEG3
- MEG8
- MEGA
- MEIS1
- MEK
- MELAS syndrome
- MELISA
- MELK