A B C D E F G H I K L M N O P R S T U V W X Ectropion Definition: The turning outward (eversion) of the edge of the eyelid, resulting in the exposure of the palpebral conjunctiva. (Dorland, 27th ed) Broader term(s) Eye Diseases Eyelid Diseases Ectropion MeSH © U.S. National Library of Medicine®.