Cataract

Cataract
Cataract Cat"a*ract, n. [L. cataracta, catarracles, a waterfall, Gr. ?, ?, fr. ? to break down; in the passive, to fall or rush down (of tumors) to burst; kata` down + ? to break.] 1. A great fall of water over a precipice; a large waterfall. [1913 Webster]

2. (Surg.) An opacity of the crystalline lens, or of its capsule, which prevents the passage of the rays of light and impairs or destroys the sight. [1913 Webster]

3. (Mach.) A kind of hydraulic brake for regulating the action of pumping engines and other machines; -- sometimes called {dashpot}. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

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Synonyms:
, , / , (from opacity of the crystalline lens)


Look at other dictionaries:

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  • cataract — [kat′ə rakt΄] n. [ME cataracte, floodgate (of heaven), cataract (of the eye) < L cataracta, a waterfall, portcullis < Gr katarhaktēs < katarhassein, to dash down < kata , down + rhassein, to strike or ? arassein, to smite] 1. a large… …   English World dictionary

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  • cataract — (n.) early 15c., from L. cataracta waterfall, from Gk. katarhaktes waterfall, broken water; swooping, rushing down; portcullis, noun use of adjective from kata down (see CATA (Cf. cata )) + arhattein to strike hard. Its alternative sense in Latin …   Etymology dictionary

  • cataract — n *flood, deluge, inundation, torrent, spate …   New Dictionary of Synonyms

  • cataract — ► NOUN 1) a large waterfall. 2) a medical condition in which the lens of the eye becomes progressively opaque, resulting in blurred vision. ORIGIN Latin cataracta waterfall, floodgate , also portcullis (sense 2 probably being a figurative use of… …   English terms dictionary

  • Cataract — For other uses, see Cataract (disambiguation). Cataract Classification and external resources Magnified view of cataract in human eye, seen on examination with a slit lamp using diffuse illumination …   Wikipedia

  • Cataract — A clouding of the lens of the eye. The normally clear aspirin sized lens of the eye starts to become cloudy. The result is much like smearing grease over the lens of a camera. It impairs normal vision. There are many causes of cataracts including …   Medical dictionary

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