- mailA bag or wallet.
- maculaAn oval yellow spot near the center of the retina of the human eye, histologically defined as having two or more layers of ganglion cells, responsible for detailed central vision.
- maquisDense Mediterranean coastal scrub.
- macchiaAny shrubland biota in Mediterranean countries, typically consisting of densely-growing evergreen shrubs.
- macleChiastolite; so called from the tessellated appearance of a cross-section.
- macula luteamacula (yellow spot in the human eye)