|the study and practice of determining the structure of a crystal by passing a beam of X-rays through it and observing and analysing the diffraction pattern produced|
|a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.|
|a chattering or flighty, light-headed person.|
The study of molecular structure by examining diffraction patterns made by x-rays beamed through a crystalline form of the molecules. X-ray crystallography is used extensively in biochemistry to examine the molecular structure of such molecules as proteins and DNA.