Look up cataract in Wiktionary, the free dictionary.
A cataract is an opacity in the lens of the eye or its capsule.
Cataract also may refer to:
- Cataract, any large, powerful waterfall
- Cataract (beam engine), governor used for early steam engines
- Jehu (or John) O'Cataract, two pen names for John Neal (1793-1876)
- Shawinigan Cataractes, ice-hockey team