| circulus arteriosus iridis major | An arterial circle at the ciliary border of the iris. Synonym: circulus arteriosus iridis major. (05 Mar 2000) |
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| circulus arteriosus iridis minor | An arterial circle near the pupillary margin of the iris. Synonym: circulus arteriosus iridis minor. (05 Mar 2000) |
| coloboma iridis | Retention of the choroid fissure causing a congenital cleft of the iris, often associated with coloboma of the choroid, viable in the inferior ocular fundus, obsolete term for the iris defect resulting from a large surgical iridectomy. (05 Mar 2000) |
| plicae iridis | Numerous very fine, almost microscopic, radial folds on the posterior surface of the iris that extend around the pupillary margin. Synonym: plicae iridis. (05 Mar 2000) |
| heterochromia iridis | A difference of colour between the iris of one eye and the other. (a person with one brown and one blue eye has heterochromia iridis.) also, a difference in colour within an iris (sectoral heterochromia iridis). (12 Dec 1998) |
| stratum pigmenti iridis | The double layer of pigmented epithelium on the posterior surface of the iris. Synonym: pigmented layer of iris. (05 Mar 2000) |
| stroma iridis | The delicate vascular connective tissue that lies between the anterior surface of the iris and the pars iridica retinae. Synonym: stroma iridis. (05 Mar 2000) |
| facies anterior iridis | The anterior surface of the iris of the eye. Synonym: facies anterior iridis. (05 Mar 2000) |
| facies posterior iridis | The posterior surface of the iris. Synonym: facies posterior iridis. (05 Mar 2000) |
| ligamentum pectinatum iridis | Pectinate ligaments of iridocorneal angle. See: trabecular reticulum. (05 Mar 2000) |
| Goodell's dilator | An obsolete term for a uterine dilator used for dilating the cervix. (05 Mar 2000) |
| Chevalier-Jackson dilator | An oesophageal dilator that passes through a rigid endoscope. (05 Mar 2000) |
| Walther's dilator | A gently curved instrument that tapers to an increased diameter, used to dilate the female urethra. (05 Mar 2000) |
| Plummer's dilator | An instrument for dilating the lower end of the oesophagus in cardiospasm; it consists of a rubber tube with a perforated metal tip, and a dilatable elongated balloon near its lower end; in difficult cases the tube is threaded along a guiding thread swallowed by the patient. (05 Mar 2000) |
| hydrostatic dilator | An instrument for dilating oesophageal strictures; fluid pressure is delivered into a flexible area of the instrument placed in the stricture to establish a uniform dilating pressure. (05 Mar 2000) |