- MeV linear accelerator
- Mevacor
- Mexate
- Mexate-AQ
- Mexican valerian
- MG 98
- MG98
- MGCD0103
- MGUS
- micellar nanoparticle-encapsulated cisplatin NC-6004
- micelle
- microbicide
- microcalcification
- microflora
- microfluidic device
- microgram
- microliter
- micrometastasis
- micromolar
- micromole
- micronutrient
- micronutrient-fortified probiotic yogurt
- microorganism
- microRNA
- microsatellite
- microsatellite instability
- microscope
- microscopic
- microsphere
- microstaging
- microtubulin inhibitor EPC2407
- microwave acupuncture
- microwave therapy
- microwave thermotherapy
- midazolam
- midazolam hydrochloride
- midostaurin
- mifamurtide
- Mifeprex
- mifepristone
- milatuzumab
- Milestrol
- milk duct
- Milk of Magnesia
- milk protein-based energy drink
- milk thistle
- milligram
- milliliter
- millimeter
- millimole