Company sergeant major. The company sergeant major (CSM) is the senior non-commissioned soldier of a company in the armies of many Commonwealth countries, responsible for administration, standards and discipline. In combat, his prime responsibility is the supply of ammunition to the company.
Urothelium The urothelium is a layer that lines much of the urinary tract, including the renal pelvis, the ureters, the bladder, and parts of the urethra. U.S. National Library of Medicine (0.00 / 0 votes) Rate this definition:
Medical Definition of ENDOTHELIUM. : an epithelium of mesoblastic origin composed of a single layer of thin flattened cells that lines internal body cavities (as the serous cavities or the interior of the heart).. : an epithelium of mesodermal origin composed of a single layer of thin flattened cells that lines internal body cavities and the lumens of vessels. 2. : the inner layer of the seed coat of some plants.