Pain in the lacrimal sac (the tear-collecting pouch in the eye).
From Greek 'dakryon' (tear) + 'kystis' (sac) + '-algia' (pain). This combines the anatomical structure with the medical indicator of pain.
When the tear sac gets infected or clogged, you get pain in the inner corner of your eye—this specific word tells doctors exactly where the problem is!
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