cataract

英 ['kætərækt] 美 ['kætərækt]

解释

※ 提供单词"cataract"的中文意思、发音示范及音标对照，中英文词源、例句和用法等。

cataract 白内障，大瀑布

cata-, 向下。-ract, 流，倾泻，词源不详。原指大瀑布，后用做白内障的委婉语。

cataract: cataract: [15] Greek kataráktēs meant literally ‘swooping down, rushing down’; it was a derivative of the verb katarássein, a compound formed from the prefix katá- ‘down’ (which appears in a wide range of English words, including cataclysm, catalepsy, catalogue, catapult – literally ‘hurl down’ – and catastrophe) and the verb rássein ‘strike’.

Hence it was applied metaphorically to various things that ‘rush down’, including waterfalls and portcullises. The word passed into English via Latin cataracta, and the sense ‘opacity of the eye’s lens’ developed in the 16th century, probably as a metaphorical extension of the now obsolete ‘portcullis’.
cataract (n.): early 15c., "a waterfall, floodgate," from Latin cataracta "waterfall," from Greek katarhaktes "waterfall, broken water; a kind of portcullis," noun use of an adjective compound meaning "swooping, down-rushing," from kata "down" (see cata-). The second element is traced either to arhattein "to strike hard" (in which case the compound is kat-arrhattein), or to rhattein "to dash, break."

Its alternative sense in Latin of "portcullis" probably was passed through French to form the English meaning "eye disease" (early 15c.), on the notion of "obstruction" (to eyesight).

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1. He is an elderly gentleman who had had a cataract operation.: 他是一位曾经动过白内障手术的老人.

4. As he stood there, this cataract on a sudden increased in volume.: 他站在那儿, 这道瀑布忽然越来越大了.

5. The good news from the battlefields is becoming a cataract.: 战场上传来的好消息正在变成一道奔流.