Define nadir. nadir synonyms, nadir pronunciation, nadir translation, English dictionary definition of nadir. n. 1. Astronomy A point on the celestial sphere directly below the observer, diametrically opposite the zenith. 2. The lowest point: the nadir of their...
Annular tear â definition and causes. By Michael Perry, M.D. An annular tear is one of the most common degenerative spine conditions that develop with the natural aging process of the spine. In fact, many people over the age of 50 have an annular tear and never know it.
Congenital Abnormalities. Annular Pancreas â is usually a band of pancreatic tissue that completely encircles the second portion of the duodenum, and may cause duodenal stenosis. Annular pancreas is a rare finding (~3/20,000 autopsies).