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.
An annular disc tear is when the substance of the annulus fibrosus rips or tears, allowing the highly pressurized and nucleus pulposus to escape outward toward the outer third of the disc. + 30 others found this useful.Kerry Donnelly Wisner.t basically means that there is a small herniation (or bulging out) of one of the disks in your spine. L4-L5 is the position of the disk in your spine, and refers to Lumbar â¦ spine disk 4 and 5, aka it is to do with your lower spine.