mars - miss
- marsh
- marsh buggy
- marsh buggy tyre
- marshal
- marshaling yard
- marshall springs
- marshalling
- marshy
- marshy ground
- marshy soil
- martempering
- martensite formation
- martensitic hardening
- mascot
- maser
- mash
- mash kettle
- masked inlet valve
- masking
- masking liquid
- masking-balance
- mass
- mass airflow sensor
- mass damper
- mass flowmeter
- mass power
- mass produced
- mass productability
- mass production
- mass resistivity
- mass resolution
- mass separator
- mass spectrometer
- mass transportation facilities
- mass-energy relation
- mass-produced car
- massed start
- massive design
- massless
- mast
