cataract

noun
cat·​a·​ract | \ ˈka-tə-ˌrakt How to pronounce cataract (audio) \

Definition of cataract

1 [Middle English, from Middle French or Medieval Latin; Middle French catharacte, from Medieval Latin cataracta, from Latin, portcullis] : a clouding of the lens of the eye or of its surrounding transparent membrane that obstructs the passage of light
2a obsolete : waterspout
b : waterfall especially : a large one over a precipice
c : steep rapids in a river the cataracts of the Nile
d : downpour, flood cataracts of rain cataracts of information

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Other Words from cataract

cataractous \ ˌka-​tə-​ˈrak-​təs How to pronounce cataractous (audio) \ adjective

Synonyms for cataract

Synonyms

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Did You Know?

The meaning of "cataract" we're most familiar with is also the oldest. It dates to the 14th century and comes from the Latin word cataracta, meaning "portcullis," probably because the ocular cataract obstructs vision in a way reminiscent of the way the portcullis's heavy iron grating obstructs passage into a fortress or castle. Latin cataracta has another meaning, however-"waterfall"-and that meaning gave us the water-related meanings that came in later centuries. The connection between the two Latin meanings can be seen in katarassein, the Greek source of cataracta. It means "to dash down"-an action we see in both the slamming portcullis and the cascading waterfall.

Examples of cataract in a Sentence

the roaring cataract is one of the park's most majestic sights in spring the melting snows usually produce a cataract that inundates the valley
Recent Examples on the Web Her left eye, which has a cataract and a dislocated lens, can be corrected to about 20/30 vision, much to the surprise of her eye doctors. Nara Schoenberg, chicagotribune.com, "As vaccine opposition grows, survivors of measles, mumps and rubella warn of lifelong effects, including vision loss, deafness: ‘How different my life would have been’," 19 July 2019 Fortunately, surgery to remove cataracts is generally safe and highly effective. Amir Khan, sun-sentinel.com, "Surgery to treat cataract can wait if vision hasn’t been affected yet," 6 June 2019 Corn provides protective antioxidants Lutein and zeaxanthin, corn’s main carotenoids (or pigments), help protect your eyes, and have been shown to reduce the risk of macular degeneration and cataracts. Cynthia Sass, Mph, Health.com, "4 Health Benefits of Corn," 12 Aug. 2019 However, her vision remained impaired due to scarring and the formation of a cataract caused by the infection. NBC News, "Woman nearly loses sight in one eye after wearing contacts in shower and pool," 17 July 2019 In 2016, Forus Health, a Bengaluru medical startup, won FDA approval for its inexpensive and portable imaging device that scans for cataracts and other eye problems. Vijay Govindarajan, Fortune, "To Lower Health Care Costs, Look to International Innovations," 10 Sep. 2019 The team provided malaria testing, and also treated a variety of medical conditions, including severe hypertension, urinary tract infections, gastrointestinal viruses and cataracts (even among younger patients). Karen Pilarski, Milwaukee Journal Sentinel, "Two Wauwatosa nurses traveled with medical professionals on a mission trip to Tanzania to provide medical care," 12 Aug. 2019 After several years, a desk editor complained the smoke was bothering his cataracts. Greg Gilbert, The Seattle Times, "In 52 years at The Seattle Times, photographer Greg Gilbert has seen it all. But he wants to see more.," 31 July 2019 One way to think of katabatic winds is to picture them as gargantuan cataracts of air moving over the ice sheets. Barry Lopez, Harper's magazine, "Polar Light," 10 Jan. 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'cataract.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of cataract

14th century, in the meaning defined at sense 1

History and Etymology for cataract

Latin cataracta waterfall, portcullis, from Greek kataraktēs, from katarassein to dash down, from kata- + arassein to strike, dash

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Statistics for cataract

Last Updated

25 Oct 2019

Time Traveler for cataract

The first known use of cataract was in the 14th century

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More Definitions for cataract

cataract

noun
How to pronounce cataract (audio)

English Language Learners Definition of cataract

medical : a condition in which a part of your eye (called the lens) becomes cloudy and you cannot see well
literary : a large waterfall

cataract

noun
cat·​a·​ract | \ ˈka-tə-ˌrakt How to pronounce cataract (audio) \

Kids Definition of cataract

1 : a clouding of the lens of the eye or of the cover around the lens that blocks the passage of light
2 : a large waterfall
3 : a sudden rush or flow like a waterfall

cataract

noun
cat·​a·​ract | \ ˈkat-ə-ˌrakt How to pronounce cataract (audio) \

Medical Definition of cataract

: a clouding of the lens of the eye or its surrounding transparent membrane that obstructs the passage of light

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Comments on cataract

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