X- BAND   :   

The radio frequency band that extends from 5200 to 10 900 MHz.

X- LINKED DISEASE   :   

The mutation on X-chromosome that causes a genetic disease is called as X-linked disease.

X-CHROMOSOME   :   

One of two sex chromosomes in higher organisms that defines the gender of the adult. In almost all sexually reproducing organisms, the X-chromosome defines female characteristics.

XENOBIOTICS   :   

Molecules entering an organism that has no physiological function and is not found in an organism if not taken up by eating, breathing, or injury. The term xenobiotics is used to describe a foreign particle or molecule that is potentially dangerous or toxic.

X-RAY   :   

Electromagnetic radiation of very short wavelength and very high energy; x-rays have shorter wavelengths than ultraviolet light but longer wavelengths than cosmic rays.

X-RAY CRYSTALLOGRAPHY   :   

The diffraction pattern seen after passing X-rays through a pure crystal substance is called X-ray crystallography.