macroinstruction, macromolecule, macrophage, macrophotography, macroscopic, macrospore

magneto, magnetosphere, magnetometer, magnetoelectric

malcontent, malabsorption, maladaptation, maladaptive, maladjusted, maladjustment, maladministration, maladroit, malapropos, malassimilation

mastectomy, mastitis, mastoid

megabyte, megacephalic, megacity, megacycle, megadeath, megahertz, megalithic, megaphone, megapixel, megaspore, megaton, megawatt

mesoderm, mesolithic, mesosphere

metacarpus, metamathematics, metamorphic, metamorphosis, metapolitics, metastasis, metatarsal

microbiology, microcephalic, microchip, microcircuit, microclimate, microcomputer, microdot, microeconomics, microelectronics, microfiche, microfilm, micrography, microinstruction, micrology, micromanage, micromania, micrometer

mini-series, miniskirt, minimal, minimum

mischief, miscreant, misadventure, mischance, miscounsel, miscount, misdemeanor, misfeasance, misuse, misaligned, misalignment, misalliance, misapplication

misogamy, misogyny, misogynist, misology

monoculture, monogeny, monogony, monograph, monogyny, monolingual, monomer, monometallic, monomorphous, mononuclear, monophagous, monophobia, monophonic, monoplane, monopode, monopolylogue

morphogeny, morphology, morphogenesis

motorcade, motorist, motorway

music, musicology, musicologist, musicotherapy

mycology, mycosis, mycoplasma

myeloid, myeloma, myelodysplastic

myxoma, myxoid, myxomatosis