- mayfish
- methocarbamol
- muscle relaxation
- medieval
- maraschino liqueur
- mishna
- melanesian people
- melanie klein
- miscellaneous time
- miscendus
- mishit
- mixed base notation
- mallee fowl
- mound over
- mocking
- moorgame
- marsh horsetail
- mud hen
- marsh hawk
- mercury chloride
- megavitamin therapy
- Malaclemys
- Masticophis
- maize sheller
- mishegaas
- meshugaas
- mishegoss
- mollie
- molly
- marbles
- mountain spinach
- mower
- malus coronaria
- mauler
- mrs.
- motor neuron
- motor nerve fiber
- motoneuron
- mesencephalon
- medulla
- midbrain
- myelencephalon
- myonecrosis
- medulla oblongata
- mobocratic
- man_of_war bird
- metal filing
- MP
- military policeman
- maser