mari - merc
- marine animal oil
- marine clay
- marine engine oil
- marine soap
- mariotte bottle
- marjoram oil
- mark
- marked line
- market bleach
- marking ink
- markovnikov's rule
- marseille soap
- marsh gas
- marsh test
- marshall's acid
- martens hardness tester
- martens heat resistance test
- martensite
- maser
- mash
- mask
- masking
- masking agent
- masking reagent
- mason's hydrated lime
- masonry cement
- mass acceleration
- mass action
- mass balance
- mass concentration
- mass defect
- mass number
- mass polymerization
- mass production
- mass radiation
- mass spectrograph
- mass spectrometer
- mass spectrometry
- mass spectroscopy
- mass spectrum
