Entry 1 sense Webster, 1913 Eyesore /īʹsôr/ · Eye·sore · IPA /ˈaɪsoɹ/ 01 n. Something offensive to the eye or sight; a blemish. 1. Something offensive to the eye or sight; a blemish. “Mordecai was an eyesore to Haman.” — L'Estrange.