One of the mysteries of the English language finally explained.
A small phlyctena; specifically (Ophthalmology) a small vesicle or nodule of the conjunctiva or cornea, seen as a delayed hypersensitivity reaction, especially to tubercular or staphylococcal antigens.
Early 19th century. From scientific Latin phlyctenula from classical Latin phlyctaena + -ula.
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