- micropyrometer
- microscopy
- microvalve
- microwave
- microwave circulator
- microwave diode
- microwave filter
- microwave heating
- microwave reflectometer
- Mikhailov criterion
- mil concentrator
- milk cooling
- millicurie
- millihenry
- meson scattering
- mesonic molecule
- mesonium
- mesothorium
- metal rectifier
- metallic glasses
- metallographic
- metalmict state
- meteorological map
- meter frame
- metering circuit
- methane liquid
- metric waves
- mica cone
- microampere
- microbarograph
- microcanonical
- microdischarge
- micrometer
- micromethod
- microscopic
- microwave attenuator
- microwave bridge
- microwave pumping
- mesosphere
- metal housing
- metallic insulator
- metallicity
- metastable equilibrium
- meter support
- methyl chloride
- methyl formate
- microchemistry
- microcoulomb
- microfarad
- micromechanics
- micrometric
- micromotor
- microorganism protection
- microphonism
- microquantity
- microscism
- microscope stage
- microwave wavemeter
- milk cooler
- milligauss
- milliradian
- miniature refrigerator
- Minkowski electrodynamics
- mirror image
- mirror telescope
- miscible
- misfire
- mix cooling
- mix pipeline
- mixed reflection
- microwave waveguide
- milking booster
- millisecond
- miniature resistor
- minicooler
- minimum temperature
- mining
- Minkowski metric
- minor
- minor scale
- minor switch
- minor tone
- minority carrier
- mirror machine
- misalignment
- missile
- mix pump
- milliroentgen
- miniature motor
- Minkowski geometry
- minus tapping
- mirror galvanometer
- miscible oil
- mixed refrigerant
- mixer circuit
- mixing chamber
- mixing damper
- mixing divider
- mixing heat
- mixing temperature