| ring ligament | Fibres of the articular capsule of the hip joint encircling the neck of the femur. Synonym: orbicular zone, ring ligament, zonular band. (05 Mar 2000) |
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| ring-like corneal dystrophy | Thread-like opacities of the anterior corneal stroma, with acute, painful onset followed by decreased vision; autosomal dominant inheritance. (05 Mar 2000) |
| ring-necked | <zoology> Having a well defined ring of colour around the neck. <zoology> Ring-necked duck, an American scaup duck (Aythya collaris). The head, neck, and breast of the adult male are black, and a narrow, but conspicuous, red ring encircles the neck. This ring is absent in the female. Synonym: ring-neck, ring-necked blackhead, ringbill, tufted duck, and black jack. Source: Websters Dictionary (01 Mar 1998) |
| ring of iris | Either of two zones on the anterior surface of the iris, separated by a circular line concentric with the pupillary border. Synonym: annulus iridis. (05 Mar 2000) |
| ring of Soemmerring | A mass of lenticular fibres enclosed between the anterior and posterior portion of the lenticular capsule, leaving the pupillary area relatively free. (05 Mar 2000) |
| ring pessary | A ring of rubber, plastic, or metal in which the cervix rests; designed to support the uterus and to correct prolapse of that organ. (05 Mar 2000) |
| ring precipitin test | A precipitin test in which antigen solution is carefully layered over antibody solution in a tube; as diffusion proceeds, a disk of precipitate forms where the antibody ratio is optimal. Synonym: ring test. (05 Mar 2000) |
| ring scotoma | An annular area of blindness in the visual field surrounding the fixation point in pigmentary degeneration of the retina and in glaucoma. (05 Mar 2000) |
| ring syringe | A type of Luer-Lok syringe with thumb and finger rings attached to the proximal end of the barrel and to the tip of the plunger, allowing operation of the syringe with one hand. Synonym: ring syringe. (05 Mar 2000) |
| ring-tailed | <zoology> Having the tail crossed by conspicuous bands of colour. <zoology> Ring-tailed cat, a young golden eagle. Source: Websters Dictionary (01 Mar 1998) |
| ring test | A precipitin test in which antigen solution is carefully layered over antibody solution in a tube; as diffusion proceeds, a disk of precipitate forms where the antibody ratio is optimal. Synonym: ring test. (05 Mar 2000) |
| ring ulcer of cornea | Inflammation of the greater part or the whole of the corneal periphery. (05 Mar 2000) |
| ring-wall lesion | A small ring haemorrhage in the brain that stimulates proliferation of a glial ring. (05 Mar 2000) |
| choroidal ring | A lightly pigmented crescent or ring adjacent to the optic disk. (05 Mar 2000) |
| ciliary ring | The darkly pigmented posterior zone of the ciliary body continuous with the retina at the ora serrata. Synonym: ciliary disk, ciliary ring, pars plana. Origin: Mod. L. (05 Mar 2000) |