A swelling, tumor, or cyst-like growth on or affecting the eyelid.
From Greek 'blepharon' (eyelid) + 'onkos' (swelling or mass) + '-us' (Latin noun ending). This surgical term names abnormal growths on the eyelid.
This term fell out of favor because modern doctors just say 'eyelid lesion' or 'eyelid cyst'—but it survives in older textbooks as a reminder that medicine constantly simplifies and replaces its terminology.
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