- male joint
- maleic acid
- maleinimide
- malleable steel
- malodorous
- malonamide
- malononitrile
- malt extract
- man haulage
- mandrel socket
- manganate
- manganese peroxide
- manganocalcite
- manifold theory
- Manila resin
- manna
- mannide
- mannite
- magnetic disturbance
- magnetic medium
- magnetic order
- magnetic oxide
- magnetic permeability
- magnetic transition
- magnetic variation
- magnetoplumbite
- Mahler bomb
- maiden field
- maize gluten
- make
- makore
- malic
- malonic
- malor agglutinin
- maltose
- mandarin oil
- maize oil
- make oil
- make run
- malachite
- malladrite
- malm
- malonitrile
- maltha
- mammillary
- management
- managing engineer
- manandonite
- Manchurian ash
- manganese ore
- manganic
- manganite
- manganous
- Manila hemp
- mannonic acid
- manostat
- manufacturing department
- manuscript card
- manganese copper
- manganese oxide
- manganesiferous
- manganosite
- mannitan
- mansonia
- manufactured gas
- manufactured mineral
- manufacturing overhead
- marc
- margarosanite
- marginal assimilation
- marginal facies
- marginal sea
- marine denudation
- marine glue
- marker horizon
- marble quarry
- margarite
- marginal geosyncline
- marginal texture
- marginal zone
- marine arch
- Marketing
- markstone
- marlaceous
- marlstone
- marly
- marly limestone
- marmoraceous
- marscoite
- marshalling yard
- marshy plain
- martensitic
- martensitic steel
- mass action
- mass number
- mass spectrum
- mass transfer
- massive reaction
- massive texture
- mast