- monogenic conglometer
- monomineral fraction
- monomolecular
- monomolecular reaction
- monophase reaction
- monovalent
- monoxide
- montanite
- Montian stage
- monticellite
- montroydite
- Mooney unit
- Mooney viscosity
- moonstone
- mooring buoy
- moranic debris
- mordant
- mordenite
- morpholine
- morphological
- Morse taper
- mortar structure
- moss
- mother
- mother substance
- motor spirit
- motor valve
- mould breathing
- mouth opening
- movable sprayer
- moving bed
- mucilage
- mucoitinsuphur
- mud box
- mud cock
- mud cone
- mud engineer
- mud grouting
- mud hose
- mud mixer
- mud pit
- mud screen
- mud solution
- mud thickener
- mudscreen
- multi-component
- morganite
- morion
- morphotype
- mortar additive
- morvenite
- mosaic
- mosaic texture
- mosandrite
- moss peat
- mossite
- mother fate
- mother oil
- motor benzene
- motor gasoline
- motor oil
- motor starting
- motor winch
- mottled clay
- mould shrinkage
- moulding powder
- mountain coast
- mountain country
- mountain crystal
- mountain glacier
- mountain marking
- mountain stream
- mountain system
- mountain wax
- mounting flange
- mouth piece
- moving moraine
- mrky
- muciferous
- mucin
- muck soil
- muckle
- mucoitinsulfur
- muconic
- mud belt
- mud cake
- mud circulation
- mud collector
- mud crack
- mud crater
- mud fluid
- mud hopper
- mud log
- mud lump
- mud penetration
- mud pot
- mud scale
- mud thickening
- mudding
- muhimbi