An old-fashioned term for the muscle or fiber connecting the eye to the brain, or sometimes a mistaken reference to parts of the eye's anatomy.
From 'eye' + 'string' (a cord-like structure). A folk anatomical term from earlier centuries that conflated various eye structures with string-like components.
Terms like 'eyestring' reveal how people once imagined the body as a system of strings and pulleys—when anatomy was mysterious, metaphors from everyday objects made bodies seem understandable, even if they were medically incorrect.
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