IPA: /ɛnˈtroʊpiən/
KK: /ɛnˈtroʊpiən/
A condition where the edge of the eyelid turns inward, causing irritation to the eye.
The doctor diagnosed her with entropion, which was causing her discomfort.
Entropion is formed from "en-" (meaning in or within) and "tropion" (from Greek "tropos", meaning turn or change). The word describes a condition where the eyelid turns inward, causing irritation to the eye, hence the idea of turning inwards.
Think of the eyelid 'turning in' ('tropion') towards the eye, which helps you remember that entropion is a condition where the eyelid folds inward.