EYESTONE
\ˈa͡ɪstə͡ʊn], \ˈaɪstəʊn], \ˈaɪ_s_t_əʊ_n]\
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A small calcareous body, the operculum of small Turbinidae, used for removing substances from between the lid and ball of the eye. Being put into the inner corner of the eye, it works its way out at the outer corner, bringing with it any foreign substance.
By Daniel Lyons
