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| a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question. |
| a stew of meat, vegetables, potatoes, etc. |
| X-ray crystallography | |
| —n | |
| 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 | |
| x-ray crystallography
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. |