| cannula | <equipment> A tube for insertion into a duct or cavity, during insertion its lumen is usually occupied by a trocar. (18 Nov 1997) |
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| perfusion cannula | A double-barreled cannula used for irrigation of a cavity, the wash fluid passing into the cavity through one tube and out through the other. Washout cannula, a cannula that can be irrigated without removal from the artery. (05 Mar 2000) |
| 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) |
| 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) |
| laparoscopic cannula | hasson cannula |