From Online Dictionary of Crystallography

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

P

Q

R

S

T

U

V

W

X

Y

Z

M

Mallard's law
mapping
maximum likelihood
merohedral
merohedry
mesh
metric tensor
Miller indices
modulated crystal structure
molecular replacement
mosaic crystal
multiwavelength anomalous diffraction (MAD)