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.
Annular pancreas. Annular pancreas: Introduction. Annular pancreas: An abnormality where a ring of pancreatic tissue forms around the duodenum and can block the flow of food through the digestive system. The severity of symptoms depends on the degree of constriction. Partial obstruction may not be detected until adulthood.