- metalliferous vein
- metastable equilibrium
- metrical geometry
- micro wave
- microgroove
- micromillimetre
- microphone
- Minkowski space
- minor sixth
- minor third
- mirage
- microwave spectroscopy
- microwave waveguide
- millibar
- minute
- mirror nuclide
- mixed light
- mixed radiation
- minimum deviation
- minor semitone
- minus
- mirror nuclei
- modal notes
- metric key
- microcrack
- microwave frequency
- miniature film
- minor second
- minor seventh
- mirror lens
- mobile laboratory
- Mobius strip
- moderate
- modulateb
- modulated
- modulated groove
- modulated oscillations
- modulation method
- modulation process
- modulatorb
- molecular assembler
- molecular density
- molecular orbital
- molecular spectrum
- molecular weight
- momenta
- momentum principle
- monatomic gas
- monofilament
- molecular conductivity
- molecular machine
- molten
- moment
- moment distribution
- moment equation
- momentum
- momentum method
- mordant dyeing
- mounted filter
- mounting foot
- motion blur
- motion equation
- motor method
- multimode fibre
- multiple exposure
- multiple splitting
- multipole
- molecular energy
- molecular field
- molecular manufacturing
- molecular pump
- molecular spectroanalysis
- molecular wire
- molecule energy
- motion
- motor
- multichannel analyzer
- multielectron atom
- multitrack recording
- mumetal
- muteness
- nagatelite
- nanites
- nanoarray
- nanobarcode
- nanodefense
- nanodisaster
- nanomaterials
- nanosource
- nanostructure
- multimode fiber
- multinuclear
- multiplicity
- nanochip
- nanocrystal
- nanoelectromechanical system
- nanoprobe
- nanorods
- nanosurgery
- nanoterrorism