Meanings
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Thesaurus
The animal-pen noun descends from Old English sti or stig, 'hall, pen,' with Germanic cognates for livestock enclosures; the filthy-place sense is a comparison with a pigpen. The eyelid word is a separate history: sty is a variant of stye, probably back-formed from Middle English styany, from Old English stigend, literally 'riser,' for the swelling.