The term X-RAYING UNIT is composed of two words: 'X-raying' and 'UNIT'. The first word, 'X-raying', refers to the process of using X-rays to examine the internal structure of an object. The second word, 'UNIT', refers to a group of people or things that are organized together for a specific purpose. Together, the two words refer to a group of people or machines that are organized together to use X-rays to examine the internal structure of an object. The crossword solution for this term is RAD, which stands for 'Radiology'. Radiology is the medical specialty that uses imaging techniques such as X-rays, ultrasound, and magnetic resonance imaging (MRI) to diagnose and treat diseases.