A B C D E F G H I K L M N O P R S T U V W X Entropion Definition: The turning inward (inversion) of the edge of the eyelid, with the tarsal cartilage turned inward toward the eyeball. (Dorland, 27th ed) Broader term(s) Eye Diseases Eyelid Diseases Entropion MeSH © U.S. National Library of Medicine®.