cataract

Term: cataract

Origin:  Anc Greek καταρράκτης/cataractis(=waterfall) >

κατά/cata(=down)+ ράσω>ροή/roe(=running of water) à pour down

Coined: the term was coined in modern ophthalmology  metaphorically  because the whiteness is supposed to be reminiscent of the churned-up water of a cataract.

Definition:

Eye disease that involves the opacity of the natural lens of the eye or in its envelope causing impairment of vision