- microcyte
- megaloblast
- mail box
- mycosis fungoides
- mycothricin
- mefloquine hydrochloride
- mitochondrion
- mitotic phase
- mutagenic treatment
- methicillin
- Mithracin
- mithramycin
- monotreme
- malvastrum coccineum
- mammary_duct fistula
- malus sylvestris
- malva moschata
- malvales
- menyanthes trifoliata
- messily
- malacostracan crustacean
- malacothamnus fasciculatus
- matthias schleiden
- mallow family
- Malvaceae
- Monotropaceae
- mignonette family
- mountain hemlock
- momot
- motmot
- mergus albellus
- melanitta nigra
- melanemia
- melopsittacus undulatus
- melophagus ovinus
- musci
- milvus migrans
- momus
- melospiza georgiana
- merosmia
- meleagris gallopavo
- Mexican hairless
- monstera deliciosa
- monstrosity
- moonshiner
- mafioso
- moon_curser
- meropia
- mimir
- malaclemys centrata