| limiting angle | The angle of incidence at which a ray of light, in passing between two media, changes from refraction to total reflection. Synonym: limiting angle. (05 Mar 2000) |
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| line angle | In dentistry, the junction of two surfaces of the crown of a tooth, or of a tooth cavity (cavity line angle). (05 Mar 2000) |
| Louis' angle | The angle between the manubrium and the body of the sternum at the manubriosternal junction. Marks the level of the second costal cartilage (rib) for counting ribs or intercostal spaces. Denotes level of aortic arch, bifurcation of trachea, and T4/T5 intervertebral disc. Synonym: angulus sterni, Louis' angle, Ludwig's angle, manubriosternal junction. (05 Mar 2000) |
| Lovibond's angle | The angle made at the meeting of the proximal nail fold and the nail plate when viewed from the radial aspect; normally, less than 180 |
| Ludwig's angle | The angle between the manubrium and the body of the sternum at the manubriosternal junction. Marks the level of the second costal cartilage (rib) for counting ribs or intercostal spaces. Denotes level of aortic arch, bifurcation of trachea, and T4/T5 intervertebral disc. Synonym: angulus sterni, Louis' angle, Ludwig's angle, manubriosternal junction. (05 Mar 2000) |
| lumbosacral angle | The angle between the long axis of the lumbar part of the vertebral column and that of the sacrum. (05 Mar 2000) |