| annular scleritis | An often protracted inflammation of the anterior portion of the sclera, forming a ring around the corneoscleral limbus. (05 Mar 2000) |
|---|---|
| annular scotoma | A circular scotoma surrounding the centre of the field of vision. See: ring scotoma. (05 Mar 2000) |
| annular sphincter | A short thickening of circular muscular fibres, similar to a ring; a ring-shaped sphincter as opposed to a segmental sphincter. (05 Mar 2000) |
| annular staphyloma | A staphyloma extending around the periphery of the cornea. (05 Mar 2000) |
| annular stop | <microscopy> The opaque ring-shaped stop with a small central opening usually placed in the objective back focal plane to provide dispersion staining. (05 Aug 1998) |
| annular stricture | A ringlike constriction encircling the wall of a canal. (05 Mar 2000) |
| annular synechia | Adhesion of the entire pupillary margin of the iris to the capsule of the lens. (05 Mar 2000) |
| annular syphilid | Cutaneous lesions of secondary syphilis in which the papules form annular lesions with raised papular borders and clear central portions. (05 Mar 2000) |
| Gerlach's annular tendon | fibrocartilaginous ring of tympanic membrane |
| agglutinative thrombus | A translucent colourless plug, partly or wholly filling a capillary or small artery or vein, formed by agglutination of red blood corpuscles. Synonym: agglutinative thrombus. (05 Mar 2000) |
| agonal thrombus | A heart clot formed during the act of dying after prolonged heart failure. (05 Mar 2000) |
| antemortem thrombus | A clot formed in the circulation during life. (05 Mar 2000) |
| ball thrombus | An antemortem thrombus found in the left or right atrium usually in certain cases of mitral stenosis. (05 Mar 2000) |
| ball-valve thrombus | Ball thrombus intermittently occluding the mitral or tricuspid orifice. (05 Mar 2000) |
| bile thrombus | An intracanalicular deposit of bile, usually a result of obstruction to bile drainage. (05 Mar 2000) |