- Magnetocardiography
- Magnetoencephalography
- Magnetofection
- Magnetometers
- Magnetoreception
- Magnetosomes
- Magnetospirillum
- Magnetotactic bacteria
- Magnetotaxis
- Magnifying glass
- Magnocellular
- Magnocellular cells
- Magnoflorine
- Magnolia officinalis
- Magnolol
- Maintenance dose
- Maintenance of Certification
- Maintenance therapy
- Maisonneuve fracture
- Maitansine
- Major Depression Inventory
- Major Diagnostic Category
- Major adverse cardiovascular events
- Major arterial circle of the iris
- Major basic protein
- Major capsid protein VP1
- Major depressive disorder
- Major depressive episode
- Major duodenal papilla
- Major facilitator superfamily
- Major gene
- Major intrinsic proteins
- Major trauma
- Major vault protein
- Makaton
- Malabsorption
- Malabsorption syndromes
- Malachite green
- Malacia
- Maladaptation
- Maladaptive behavior
- Maladjustment
- Malaise
- Malakoplakia
- Malaoxon
- Malar rash
- Malaria
- Malaria prophylaxis
- Malaria therapy
- Malaria vaccine
- Malassezia
- Malassezia furfur
- Malassezia globosa
- Malassezia sympodialis
- Malate aspartate shuttle
- Malate dehydrogenase
- Malate dehydrogenase 2
- Malate synthase
- Malathion
- Male accessory glands
- Male breast cancer
- Male contraceptive
- Male fertility
- Male genitalia
- Male infertility
- Male pseudohermaphroditism
- Male reproductive system
- Male reproductive tract
- Male sterilization
- Malgaigne's fracture
- Malic acid
- Malicious intent
- Malignancy
- Malignant ascites
- Malignant fibrous histiocytoma
- Malignant glioma
- Malignant histiocytosis
- Malignant hypertension
- Malignant hyperthermia
- Malignant meningioma
- Malignant narcissism
- Malignant neoplasm
- Malignant peripheral nerve sheath tumor
- Malignant pleural effusion
- Malignant teratoma
- Malignant triton tumor
- Malignant tumors
- Malingering
- Mallampati score
- Malleoli
- Malleolus
- Mallet finger
- Mallet toe
- Malleus
- Mallory bodies
- Mallory's trichrome stain
- Mallory-Weiss syndrome
- Malnutrition
- Malocclusion
- Malonaldehyde
- Malonyl CoA
- Malonyl-CoA decarboxylase
- Malpighian layer
- Malpighian tubules
- Malpractice
- Malt lymphoma
- Maltase
- Maltase glucoamylase
- Maltitol
- Maltodextrin
- Maltol
- Maltoporin
- Maltose
- Maltoside
- Maltreatment
- Malunion
- Malva sylvestris
- Malvalic acid
- Mambas
- MammaPrint
- Mammaglobin
- Mammalian brain
- Mammalian eye
- Mammarenavirus
- Mammary analogue secretory carcinoma
- Mammary gland development
- Mammary glands
- Mammary tumor
- Mammillary bodies
- Mammillary body
- Mammillothalamic tract
- Mammography
- Mammotome
- Mana
- Manchester operation
- Manchester score
- Mand
- Mandible
- Mandibular advancement splint
- Mandibular canal
- Mandibular central incisor
- Mandibular foramen
- Mandibular fossa
- Mandibular fracture
- Mandibular lateral incisor
- Mandibular nerve
- Mandibular second premolar
- Mandibular symphysis
- Mandragora
- Mandragora officinarum