Africa 
China 
Japan 
MENA 
- Methylhippuric acid
- Methylisothiazolinone
- Methylmalonic acid
- Methylmalonic acidemia
- Methylmalonyl coa
- Methylmalonyl-CoA mutase
- Methylmalonyl-CoA mutase deficiency
- Methylmalonyl-coa mutase
- Methylmercury
- Methylnaltrexone
- Methylomonas
- Methylone
- Methylotroph
- Methylparaben
- Methylphenidate
- Methylprednisolone
- Methylprednisolone acetate
- Methylselenocysteine
- Methylsulfonylmethane
- Methyltestosterone
- Methyltransferase
- Methylxanthine
- Methyprylon
- Methysergide
- Methysticin
- Metiamide
- Meticillin
- Metipranolol
- Metisazone
- Metmyoglobin
- Metoclopramide
- Metoidioplasty
- Metol
- Metolazone
- Metomidate
- Metopic suture
- Metopimazine
- Metoprolol
- Metoprolol succinate
- Metoprolol tartrate
- Metreleptin
- Metrifonate
- Metrizamide
- Metronidazole
- Metronomic therapy
- Metroplasty
- Metrorrhagia
- Metyrapone
- Metzenbaum scissors
- Mevalonate kinase
- Mevalonate kinase deficiency
- Mevalonate pathway
- Mevalonic acid
- Mexiletine
- MiR-122
- MiR-155
- MiR-206
- MiRBase
- Mianserin
- Miasma theory
- Mibefradil
- Mibolerone
- Micafungin
- Micelles
- Michaelis constant
- Michaelis-Gutmann bodies
- Michaelis-Menten equation
- Michigan Alcoholism Screening Test
- Mickey Mouse sign
- Miconazole
- Micro computed tomography
- Micro syndrome
- MicroRNA
- Microadenoma
- Microaggressions
- Microalbuminuria
- Microaneurysms
- Microangiography
- Microangiopathic hemolytic anemia
- Microangiopathy
- Microarray
- Microarray analysis
- Microarrays
- Microautophagy
- Microbacterium
- Microbalance
- Microbeads
- Microbeam
- Microbial
- Microbial mats
- Microbial pathogenesis
- Microbiological media
- Microbiology
- Microbiome
- Microbiota
- Microbolometers
- Microbubbles
- Microcalcification
- Microcarriers
- Microcephalic osteodysplastic primordial dwarfism
- Microcephaly
- Microchimerism
- Microcin
- Microcirculation
- Micrococcaceae
- Micrococcal nuclease
- Micrococcus
- Micrococcus luteus
- Microcoria
- Microcrystalline wax
- Microcystic adnexal carcinoma
- Microcystin
- Microcystin-LR
- Microcytic anemia
- Microcytosis
- Microdeletion syndrome
- Microdensitometer
- Microdialysis
- Microdiscectomy
- Microdissection
- Microdontia
- Microdosing
- Microelectrode array
- Microelectrodes
- Microembolism
- Microencapsulation
- Microenvironment
- Microfilaments
- Microfilaria
- Microfiltration
- Microflora
- Microfluidic device
- Microfluidics
- Microfluorimetry
- Microfold cells
- Microfracture
- Microfracture surgery
- Microglia
- Microglial cells
- Microglobulin
- Micrognathia
- Micrognathism
- Micrographia
- Microhematuria
- Microinjection
- Microkeratome
- Microlax
- Microlife
- Micromelia
- Micromeritics