Index of letter M
| m- | See meta- |
| -machy | Fighting. |
| macro- | Long; large. |
| magneto- | Magnetism or a magnet. |
| magn(i)- | Large; great. |
| mal- | Improperly; badly; wrongly. |
| -malacia | Abnormal softening of a tissue. |
| malaco- | Soft. |
| Malayo- | Malay; Malay and … |
| male- | See mal- |
| mamm(o)- | A breast or breasts. |
| -man | A male person of a specified type. |
| -mancy | Divination. |
| -mane | See -mania |
| mangan(o)- | Manganese. |
| -mania | Mental abnormality or obsession; extreme enthusiasm or admiration. |
| -manship | Skill in a subject or activity. |
| mast(o)- | Breast. |
| matr(i)- | A mother. |
| maxi- | Very large or long. |
| maxillo- | The jaw. |
| mebi- | see the entry Words for multiples. |
| mechano- | Mechanical. |
| medico- | Medicine plus another field. |
| medio- | Middle. |
| meg(a)- | Large or great; a factor of one million; a factor of 220. |
| -megaly | Abnormal enlargement of part of the body. |
| meio- | Less or fewer. |
| -meister | A person regarded as skilled or prominent in a specified activity. |
| melan(o)- | Black. |
| -melia | An abnormal condition of a limb. |
| mening(o)- | The meninges. |
| meno- | Menstruation. |
| -ment | Forming nouns. |
| -mer | Part or segment. |
| mercapto- | The chemical radical —SH. |
| mero- | Partly or partial. |
| -merous | See -mer |
| mesio- | A midline. |
| meso- | Middle; intermediate. |
| met(a)- | Change of position or condition; behand, after, or beyond; of a higher or second-order kind; chemical substitution. |
| metall(o)- | A metal. |
| -meter | Measuring instrument; unit of measurement. |
| meth(o)- | The methyl radical, —CH3. |
| methoxy- | The methoxyl radical, CH3O— |
| -metre | See -meter |
| -metric | Measurement. |
| metr(o)-1 | The uterus. |
| metr(o)-2 | Measurement. |
| metro-3 | A capital city or other large urban area. |
| -metropia | A condition of the eye. |
| micro- | Small; a factor of one millionth. |
| mid- | Middle; medium; half. |
| midi- | Medium-sized; of medium length. |
| milli- | One thousandth; a thousand. |
| mini- | Very small of its kind. |
| mio- | See meio- |
| mis- | Various senses with negative implications. |
| mis(o)- | Hatred for or a hater of something. |
| -mo | Book sizes. |
| -monas | Simple microorganisms. |
| -monger | A dealer or trader. |
| mon(o)- | One; alone; single. |
| -mony | Forming nouns. |
| -morph | A specified form or character. |
| morph- | See morpho- |
| -morpha | Animal groupings. |
| -morphic | See -morph |
| morph(o)- | Form or character. |
| -morphosis | See -morph |
| -most | Superlative adjectives and adverbs. |
| muco- | Mucus. |
| multi- | More than one; many. |
| multiples | Standard systems of number prefixes. |
| musculo- | Muscle. |
| my- | See myo- |
| myc- | See myco- |
| -myces | Bacteria or fungi. |
| myceto- | See myco- |
| -mycin | An antibiotic compound derived from fungi. |
| myc(o)- | Fungi or fungal. |
| -mycota | See -myces |
| myel(o)- | Bone marrow; the spinal cord. |
| my(o)- | Muscle. |
| myring(o)- | The eardrum. |
| myrmeco- | An ant or ants. |
| mytho- | Myth. |
| myx(o)- | Mucus. |
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