- Molecular orbitals
- Molecular oxygen
- Molecular pathological epidemiology
- Molecular pathology
- Molecular phenotyping
- Molecular phylogeny
- Molecular promiscuity
- Molecular sensors
- Molecular sieves
- Molecular size
- Molecular structure
- Molecular switches
- Molecular weight cut off
- Molecularly targeted therapy
- Molecule
- Molgramostim
- Molindone
- Molisch's test
- Mollaret's meningitis
- Mollicutes
- Molluscum contagiosum
- Molluscum contagiosum virus
- Molnupiravir
- Molsidomine
- Molten globule
- Molting
- Molybdate
- Molybdenum
- Molybdenum blue
- Molybdenum cofactor deficiency
- Molybdenum deficiency
- Molybdopterin
- Mometasone furoate
- Momordica
- Momordica balsamina
- Mondini dysplasia
- Mondor's disease
- Monensin
- Mongolian spots
- Moniliformin
- Monitoring
- Monkeypox
- Monkeypox virus
- MonoMAC
- Monoacylglycerol
- Monoacylglycerol lipase
- Monoamine neurotransmitters
- Monoamine oxidase
- Monoamine oxidase A
- Monoamine oxidase inhibitors
- Monoamine receptors
- Monoamine reuptake inhibitors
- Monoamine transporters
- Monoamines
- Monoarthritis
- Monobenzone
- Monobody
- Monocalcium phosphate
- Monocarboxylate transporter 8
- Monocarboxylate transporters
- Monochorionic twins
- Monochromacy
- Monochromator
- Monoclonal B cell lymphocytosis
- Monoclonal antibodies
- Monoclonal antibody
- Monoclonal antibody therapy
- Monoclonal gammopathy
- Monoclonal gammopathy of renal significance
- Monoclonal gammopathy of undetermined significance
- Monoclonality
- Monocrotophos
- Monocryl
- Monocular
- Monocular deprivation
- Monocular vision
- Monocytes
- Monocytic leukemia
- Monocytopenia
- Monocytopoiesis
- Monocytosis
- Monodehydroascorbate reductase
- Monofloral honey
- Monofluoride
- Monogastric
- Monogenic disorder
- Monoglycerides
- Monohydrogen phosphate
- Monokines
- Monolaurin
- Monomania
- Monomelic amyotrophy
- Monomers
- Monomethyl auristatin F
- Monomorphic ventricular tachycardia
- Mononegavirales
- Mononeuropathy
- Mononeuropathy multiplex
- Mononuclear cell infiltration
- Mononuclear cells
- Mononuclear phagocyte system
- Mononuclear phagocytes
- Mononucleosis
- Monooxygenase
- Monopartite
- Monophyly
- Monoplegia
- Monopotassium phosphate
- Monosaccharides
- Monosodium glutamate
- Monosomy
- Monosomy X
- Monoterpenes
- Monoterpenoids
- Monotherapy
- Monounsaturated fat
- Monounsaturated fatty acids
- Monozygotic twins
- Mons pubis
- Montelukast
- Monthly nurse
- Montmorillonite
- Montreal Cognitive Assessment
- Mood
- Mood Disorder Questionnaire
- Mood disorders
- Mood stabilizers
- Mood swings
- Moon face
- Moracizine
- Moral disengagement
- Moral enhancement
- Moral injury
- Moral reasoning
- Morale
- Moraxella
- Moraxella catarrhalis
- Morbid obesity
- Morbilliform
- Morcellation
- Mordants
- Morganella morganii
- Morgellons
- Morin
- Moringa oleifera
- Morison's pouch
- Morita therapy
- Morning glory syndrome
- Morning sickness
- Morning stiffness