cataracts Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. a clouding of the lens of the eye blocking out light and making it difficult or impossible to see; a large waterfall Example Sentence Cataracts is a clouding of the eye lens. Synonyms clouding of the lens; blocking out light; waterfall Antonyms healthy eye without any problems Hear It! Say It! Write It! cataracts Switch to cursive Start Share with your friends: