cataract

Science Dictionary
cataract   (kāt'ə-rākt')  Pronunciation Key 
  1. An opacity of the lens of the eye or the membrane that covers it, causing impairment of vision or blindness.

  2. A waterfall in which a large volume of water flows over a steep precipice.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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