| iridotomy | <procedure, surgery> The use of laser light to punch a hole in the iris to relieve intraocular pressure within the eye (for example glaucoma). This surgery is painless and requires no anaesthesia. (27 Sep 1997) |
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| iridoviridae | A family of large icosahedral DNA viruses infecting insects and poikilothermic vertebrates. Genera include iridovirus, ranavirus, chloriridovirus, lymphocystivirus, and goldfish virus 1-like viruses. (12 Dec 1998) |
| iridovirus | A genus of iridoviridae comprising small iridescent insect viruses. The infected larvae and purified virus pellets exhibit a blue to purple iridescence. (12 Dec 1998) |
| iridoviruses | <organism, virology> A group of nonoccluded viruses of insects, the crystalline array of virus particles in the cytoplasm of epidermal cells gives infected insects an irridescent appearance. (18 Nov 1997) |
| irigenin | A trihydroxy trimethoxy isoflavone component of iridin. (05 Mar 2000) |
| iris | Origin: L. Iris, iridis, the goddess, Gr, the rainbow, iris of the eye, the plant Iris. Cf. Orris. 1. The goddess of the rainbow, and swift-footed messenger of the gods. 2. The rainbow. 3. An appearance resembling the rainbow; a prismatic play of colours. 4. <anatomy> The contractile membrane perforated by the pupil, and forming the coloured portion of the eye. See Eye. 5. <botany> A genus of plants having showy flowers and bulbous or tuberous roots, of which the flower-de-luce (fleur-de-lis), orris, and other species of flag are examples. Source: Websters Dictionary (01 Mar 1998) |
| iris bicolor | A variegated or two-coloured iris. Synonym: monocular heterochromia. (05 Mar 2000) |
| iris bombe | A condition occurring in posterior annular synechia, in which an increase of fluid in the posterior chamber causes a forward bulging of the peripheral iris. (05 Mar 2000) |
| iris dehiscence | A defect of the eye characterised by multiple holes in the iris. (05 Mar 2000) |
| iris diaphragm | <microscopy> A diaphragm with thin metal leaves so arranged that the rotation of an actuating lever varies the diameter. (05 Aug 1998) |
| iris diseases | Diseases, dysfunctions, or disorders of or located in the iris. (12 Dec 1998) |
| iris freckles | Small, pigmented clusters of uveal melanocytes on the surface of the iris. (05 Mar 2000) |
| iris frill | The sinuous, scalloped line in the iris that divides the central pupillary zone from the peripheral ciliary zone and marks the embryonic site of the atrophied minor vascular circle of the iris. Synonym: iris frill. (05 Mar 2000) |
| iris neoplasms | Tumours of the iris characterised by increased pigmentation of melanocytes. Iris nevi are composed of proliferated melanocytes and are associated with neurofibromatosis and malignant melanoma of the choroid and ciliary body. Malignant melanoma of the iris often originates from preexisting nevi. (12 Dec 1998) |
| iris pits | Colobomas affecting the stroma of the iris with pigment epithelium intact. (05 Mar 2000) |