- Mullins effect
- multi-cnuclear
- multiaxial stress
- multilayer reservoir
- multiple reflection
- multipurpose grease
- moja
- molarity
- mold breathing
- mold insert
- moldavite
- molding powder
- molding sand
- mole fraction
- molecular adhesion
- molecular circuit
- molecular colloid
- molecular compound
- molecular crystal
- molecular diffusion
- molecular distillation
- molecular effusion
- molecular lattice
- molecular physics
- molecular ratio
- molecular state
- molecular volume
- molengraffite
- molybdate orange
- molybdite
- molysite
- moor coal
- moor rock
- moraine lodge
- mordant dye
- mortar
- mother cell
- mottled structure
- mould insert
- moulded hose
- moulding cycle
- mound
- mountain cork
- mountain intrusive
- mountain waste
- mtambara
- muck pile
- mud balance
- mud column
- mud flush
- mud hog
- mud lava
- mud loss
- mud socket
- mud spring
- mud tank
- mud thinner
- muddy
- muhuhu
- multi-grade
- multiparticle
- multivalve
- multivariant
- munchisonite
- muninga
- munium
- mushroom rock
- mustine
- mutual coagulation
- multifuel pump
- multiunit
- murexide
- murmanite
- muscovadite
- mush
- mush frost
- mushroom vent
- mutual induction
- mylonite
- mylonitization
- myrrh
- nacreous pigment
- nail cutter
- naphtenic soap
- naphtha dewaxing
- naphtha distillate
- naphtha scrubber
- naphtha-bitumen
- naphthalene
- naphthalenic
- naphthalin
- naphthene
- naphthene base
- naphthene series
- naphthenic
- naphthenic crude
- naphthenic hydrocarbon
- naphthoic
- naphthol
- naphthophenanthrene