Inflammation of the cornea of the eye; a medical condition affecting the clear front surface of the eye.
From Greek κέρας (keras, cornea) + -itis (inflammation suffix), standard medical terminology developed in the 18th and 19th centuries.
Ceratitis was one of the leading causes of blindness before antibiotics and modern eye care—infections could turn a clear cornea opaque in days, and doctors could only watch helplessly.
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