phlyctenule
/flɪkˈtiːnjuːl/ /ˈflɪktənjuːl/(also phlyctenula) Medicine
noun
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.
Origin
Early 19th century. From scientific Latin phlyctenula from classical Latin phlyctaena + -ula.