An archaic plural form of 'eye', used in Middle English and Early Modern English to mean multiple eyes.
From Old English 'eagan', the plural of 'eage' (eye), this form persisted through Middle English as 'eyne' or 'eyen' before being replaced by the modern 'eyes'.
Shakespeare would have been familiar with 'eyne'—it's a ghostly reminder that even basic words like 'eye' had completely different plural forms, and 'eyes' is actually the younger innovation!
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