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 Tear *. Annular Tear. Annular Fissure. A fissure or tear is a deficiency of the layers of the outer ring or annulus fibrosus. These tears are fairly common and can be identified. The tear can occur in all the layers of this outer tissue or in just some layers.