| scissors | A cutting instrument resembling shears, but smaller, consisting of two cutting blades with handles, movable on a pin in the center, by which they are held together. Often called a pair of scissors. <zoology> [Formerly written also cisors, cizars, and scissars] Scissors grinder, the European goatsucker. Origin: OE. Sisoures, OF. Cisoires (cf. F. Ciseaux), probably fr. LL. Cisorium a cutting instrument, fr. L. Caedere to cut. Cf. Chisel, Concise. The modern spelling is due to a mistaken derivation from L. Scissor one who cleaves or divides, fr. Scindere, scissum, to cut, spilt. Source: Websters Dictionary (01 Mar 1998) |
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| scissors-shadow | A distorted image seen in mixed astigmatism by retinoscopy. (05 Mar 2000) |
| scissors-tailed | <zoology> Having the outer feathers much the longest, the others decreasing regularly to the median ones. Source: Websters Dictionary (01 Mar 1998) |
| angle of iris | The acute angle between the iris and the cornea at the periphery of the anterior chamber of the eye. Synonym: angulus iridocornealis, angle of iris, angulus iridis, filtration angle. (05 Mar 2000) |
| anteflexion of iris | Rarely used term for an iris that is in part, folded forward after a severe iridodialysis so that the pigmented layer faces forward. (05 Mar 2000) |
| anterior surface of iris | The anterior surface of the iris of the eye. Synonym: facies anterior iridis. (05 Mar 2000) |
| pectinate ligaments of iris | See: trabecular reticulum. (05 Mar 2000) |
| greater arterial circle of iris | An arterial circle at the ciliary border of the iris. Synonym: circulus arteriosus iridis major. (05 Mar 2000) |
| greater ring of iris | The outer, broader of the two zones of the iris. Synonym: annulus iridis major. (05 Mar 2000) |
| 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) |
| ciliary border of iris | The peripheral border of the iris attached to the ciliary body. Synonym: margo ciliaris iridis, ciliary margin of iris. (05 Mar 2000) |
| ciliary margin of iris | The peripheral border of the iris attached to the ciliary body. Synonym: margo ciliaris iridis, ciliary margin of iris. (05 Mar 2000) |
| pigment cells of iris | Cell's of the stromal layer of the iris; in dark eyes (but not in blue) they contain granules of pigment. (05 Mar 2000) |
| pigmented layer of iris | The double layer of pigmented epithelium on the posterior surface of the iris. Synonym: pigmented layer of iris. (05 Mar 2000) |
| pillar of iris | The network of fibres (pectinate ligaments) at the iridocorneal angle between the anterior chamber of the eye and the venous sinus of the sclera; it contains spaces between the fibres that are involved in drainage of the aqueous humor, and is composed of two portions: the corneoscleral part, the part attached to the sclera, and the uveal part, the part attached to the iris. Synonym: reticulum trabeculare sclerae, Gerlach's valvula, Hueck's ligament, ligamentum annulare bulbi, pectinate ligaments of iridocorneal angle, pillar of iris, trabecular meshwork, trabecular network, trabecular zone. (05 Mar 2000) |